public static CGetHessCoarseResiIterImpl GetHessCoarseResiIterImpl_Matlab_IterLowerTri
                (object[] atoms
                , HessMatrix H
                , List <int>[] lstNewIdxRemv
                , double thres_zeroblk
                , ILinAlg ila
                , bool cloneH
                , string[] options // { "pinv(D)" }
                )
            {
                ila = null;
                if (cloneH)
                {
                    H = H.CloneHess();
                }

                bool process_disp_console = true;

                if (options != null && options.Contains("print process"))
                {
                    process_disp_console = true;
                }

                bool parallel = true;

                /// keep only lower triangle of H (lower block triangles)
                {
                    HashSet <Tuple <int, int, MatrixByArr> > lstUppTrig = new HashSet <Tuple <int, int, MatrixByArr> >();
                    foreach (ValueTuple <int, int, MatrixByArr> bc_br_bval in H.EnumBlocks())
                    {
                        int bc = bc_br_bval.Item1;
                        int br = bc_br_bval.Item2;
                        if (bc < br)
                        {
                            lstUppTrig.Add(bc_br_bval.ToTuple());
                        }
                    }
                    foreach (Tuple <int, int, MatrixByArr> bc_br_bval in lstUppTrig)
                    {
                        int bc = bc_br_bval.Item1;
                        int br = bc_br_bval.Item2;
                        HDebug.Assert(bc < br);
                        H.SetBlock(bc, br, null);
                    }
                }
                GC.Collect();

                List <DateTime> process_time = new List <DateTime>();

                //System.Console.WriteLine("begin coarse-graining");
                List <HessCoarseResiIterInfo> iterinfos = new List <HessCoarseResiIterInfo>();

                for (int iter = lstNewIdxRemv.Length - 1; iter >= 0; iter--)
                {
                    process_time.Clear();
                    if (process_disp_console)
                    {
                        process_time.Add(DateTime.UtcNow);
                        System.Console.Write(" - {0:000} : ", iter);
                    }

                    //int[] ikeep = lstNewIdxRemv[iter].Item1;
                    int[] iremv     = lstNewIdxRemv[iter].ToArray();
                    int   iremv_min = iremv.Min();
                    int   iremv_max = iremv.Max();

                    HDebug.Assert(H.ColBlockSize == H.RowBlockSize);
                    int blksize = H.ColBlockSize;
                    //HDebug.Assert(ikeep.Max() < blksize);
                    //HDebug.Assert(iremv.Max() < blksize);
                    //HDebug.Assert(iremv.Max()+1 == blksize);
                    //HDebug.Assert(iremv.Max() - iremv.Min() + 1 == iremv.Length);

                    int[] idxkeep = HEnum.HEnumFromTo(0, iremv_min - 1).ToArray();
                    int[] idxremv = HEnum.HEnumFromTo(iremv_min, iremv_max).ToArray();
                    //HDebug.Assert(idxkeep.HUnionWith(idxremv).Length == blksize);

                    HessCoarseResiIterInfo iterinfo = new HessCoarseResiIterInfo();
                    iterinfo.sizeHessBlkMat  = idxremv.Max() + 1; // H.ColBlockSize;
                    iterinfo.numAtomsRemoved = idxremv.Length;
                    iterinfo.time0           = DateTime.UtcNow;

                    ////////////////////////////////////////////////////////////////////////////////////////
                    // make C sparse
                    double C_density0;
                    double C_density1;
                    {
                        double thres_absmax = thres_zeroblk;

                        C_density0 = 0;
                        List <Tuple <int, int> > lstIdxToMakeZero = new List <Tuple <int, int> >();
                        foreach (var bc_br_bval in H.EnumBlocksInCols(idxremv))
                        {
                            int bc   = bc_br_bval.Item1;
                            int br   = bc_br_bval.Item2;
                            var bval = bc_br_bval.Item3;
                            if (br >= iremv_min)
                            {
                                // bc_br is in D, not in C
                                continue;
                            }

                            C_density0++;
                            double absmax_bval = bval.HAbsMax();
                            if (absmax_bval < thres_absmax)
                            {
                                lstIdxToMakeZero.Add(new Tuple <int, int>(bc, br));
                            }
                        }
                        C_density1 = C_density0 - lstIdxToMakeZero.Count;
                        foreach (var bc_br in lstIdxToMakeZero)
                        {
                            int bc = bc_br.Item1;
                            int br = bc_br.Item2;
                            HDebug.Assert(bc > br);
                            var Cval = H.GetBlock(bc, br);
                            var Dval = H.GetBlock(bc, bc);
                            var Aval = H.GetBlock(br, br);
                            var Bval = Cval.Tr();
                            H.SetBlock(bc, br, null);           // nCval = Cval    -Cval
                            H.SetBlock(bc, bc, Dval + Cval);    // nDval = Dval - (-Cval) = Dval + Cval
                                                                // nBval = Bval    -Bval
                            H.SetBlock(br, br, Aval + Bval);    // nAval = Aval - (-Bval) = Aval + Bval
                        }
                        iterinfo.numSetZeroBlock = lstIdxToMakeZero.Count;
                        iterinfo.numNonZeroBlock = (int)C_density1;
                        C_density0 /= (idxkeep.Length * idxremv.Length);
                        C_density1 /= (idxkeep.Length * idxremv.Length);
                    }

                    ////////////////////////////////////////////////////////////////////////////////////////
                    // get A, B, C, D
                    HessMatrix A = H;       // HessMatrix    A = H.SubMatrixByAtoms(false, idxkeep, idxkeep);
                                            // HessMatrix    B = H.SubMatrixByAtoms(false, idxkeep, idxremv);
                    HessMatrix C;           // HessMatrix    C = H.SubMatrixByAtoms(false, idxremv, idxkeep, parallel:parallel);
                    HessMatrix D;           // HessMatrix    D = H.SubMatrixByAtoms(false, idxremv, idxremv, parallel:parallel);
                    {
                        C = H.Zeros(idxremv.Length * 3, idxkeep.Length * 3);
                        D = H.Zeros(idxremv.Length * 3, idxremv.Length * 3);

                        //List<Tuple<int, int, MatrixByArr>> lst_bc_br_bval = H.EnumBlocksInCols(idxremv).ToList();
                        //foreach(var bc_br_bval in lst_bc_br_bval)
                        foreach (var bc_br_bval in H.EnumBlocksInCols(idxremv))
                        {
                            int bc   = bc_br_bval.Item1;
                            int br   = bc_br_bval.Item2;
                            var bval = bc_br_bval.Item3;

                            H.SetBlock(bc, br, null);
                            if (bc > iremv_max)
                            {
                                HDebug.Assert(false); continue;
                            }
                            if (br > iremv_max)
                            {
                                HDebug.Assert(false); continue;
                            }
                            if (br < iremv_min)
                            {
                                int nc = bc - iremv_min;
                                int nr = br;
                                HDebug.Assert(C.HasBlock(nc, nr) == false);
                                C.SetBlock(nc, nr, bval.CloneT());
                            }
                            else
                            {
                                int nc = bc - iremv_min;
                                int nr = br - iremv_min;
                                HDebug.Assert(D.HasBlock(nc, nr) == false);
                                D.SetBlock(nc, nr, bval);
                                if (nc != nr)
                                {
                                    HDebug.Assert(D.HasBlock(nr, nc) == false);
                                    D.SetBlock(nr, nc, bval.Tr());
                                }
                            }
                        }
                        HDebug.Assert(H.EnumBlocksInCols(idxremv).Count() == 0);
                    }
                    if (process_disp_console)
                    {
                        process_time.Add(DateTime.UtcNow);
                        int ptc = process_time.Count;
                        System.Console.Write("CD({0:00.00} min), ", (process_time[ptc - 1] - process_time[ptc - 2]).TotalMinutes);
                    }

                    ////////////////////////////////////////////////////////////////////////////////////////
                    // Get B.inv(D).C
                    HessMatrix B_invD_C;
                    {
                        {
                            B_invD_C = GetHessCoarseResiIterImpl_Matlab_IterLowerTri_Get_BInvDC(A, C, D, process_disp_console
                                                                                                , options
                                                                                                , thld_BinvDC: thres_zeroblk / lstNewIdxRemv.Length
                                                                                                , parallel: parallel
                                                                                                );
                        }
                        if (process_disp_console)
                        {
                            process_time.Add(DateTime.UtcNow);
                            int ptc = process_time.Count;
                            System.Console.Write("B.invD.C({0:00.00} min), ", (process_time[ptc - 1] - process_time[ptc - 2]).TotalMinutes);
                        }
                        GC.Collect(0);
                    }

                    ////////////////////////////////////////////////////////////////////////////////////////
                    // Get A - B.inv(D).C
                    /// iterinfo.numAddIgnrBlock = A.UpdateAdd(B_invD_C, -1, null, thres_zeroblk/lstNewIdxRemv.Length, parallel:parallel);
                    {
                        HessMatrix __this = A;
                        HessMatrix other  = B_invD_C;
                        double     _thres_NearZeroBlock = thres_zeroblk / lstNewIdxRemv.Length;

                        int[] _count         = new int[1];
                        int[] _count_ignored = new int[1];

                        //foreach(var bc_br_bval in other.EnumBlocks())
                        Action <ValueTuple <int, int, MatrixByArr> > func = delegate(ValueTuple <int, int, MatrixByArr> bc_br_bval)
                        {
                            _count[0]++;
                            int         bc         = bc_br_bval.Item1;
                            int         br         = bc_br_bval.Item2;
                            MatrixByArr other_bmat = bc_br_bval.Item3;
                            if (bc < br)
                            {
                                return; // continue;
                            }
                            if (other_bmat.HAbsMax() <= _thres_NearZeroBlock)
                            {
                                /// other_bmat = other_bmat    -other_bmat;
                                /// other_diag = other_diag - (-other_bmat) = other_diag + other_bmat;
                                ///  this_diag =  this_diat - B_invD_C
                                ///            =  this_diat - other_diag
                                ///            =  this_diat - (other_diag + other_bmat)
                                ///            =  this_diat - other_diag  - other_bmat
                                ///            = (this_diat - other_bmat) - other_diag
                                ///            = (this_diat - other_bmat) - (processed later)
                                ///            = (this_diat - other_bmat)
                                MatrixByArr this_diag = __this.GetBlock(bc, bc);
                                MatrixByArr new_diag  = this_diag - other_bmat;
                                __this.SetBlockLock(bc, bc, new_diag);
                                other_bmat = null;
                                lock (_count_ignored)
                                    _count_ignored[0]++;
                            }
                            if (other_bmat != null)
                            {
                                MatrixByArr this_bmat = __this.GetBlock(bc, br);
                                if (this_bmat == null)
                                {
                                    this_bmat = new double[3, 3];
                                }
                                MatrixByArr new_bmat = this_bmat - other_bmat;
                                __this.SetBlockLock(bc, br, new_bmat);
                            }
                        };
                        if (parallel)
                        {
                            HParallel.ForEach(other.EnumBlocks(), func);
                        }
                        else
                        {
                            foreach (var bc_br_bval in other.EnumBlocks())
                            {
                                func(bc_br_bval);
                            }
                        }

                        iterinfo.numAddIgnrBlock = _count_ignored[0];
                    }
                    if (process_disp_console)
                    {
                        process_time.Add(DateTime.UtcNow);
                        int ptc = process_time.Count;
                        System.Console.Write("A-BinvDC({0:00.00} min), ", (process_time[ptc - 1] - process_time[ptc - 2]).TotalMinutes);
                    }
                    //HessMatrix nH = A - B_invD_C;
                    //nH = ((nH + nH.Tr())/2).ToHessMatrix();
                    ////////////////////////////////////////////////////////////////////////////////////////
                    // Replace A -> H
                    H = A;

                    ////////////////////////////////////////////////////////////////////////////////////////
                    // print iteration log
                    iterinfo.usedMemoryByte = GC.GetTotalMemory(false);
                    iterinfo.time1          = DateTime.UtcNow;
                    iterinfos.Add(iterinfo);

                    if (process_disp_console)
                    {
                        System.Console.Write("summary(makezero {0,5}, nonzero {1,5}, numIgnMul {2,7}, numRemvAtoms {3,3}, {4,5:0.00} min, {5} mb, {6}x{6}, nzeroBlk/Atom {7:0.00}), GC("
                                             , iterinfo.numSetZeroBlock
                                             , iterinfo.numNonZeroBlock
                                             , iterinfo.numAddIgnrBlock
                                             , iterinfo.numAtomsRemoved
                                             , iterinfo.compTime.TotalMinutes
                                             , iterinfo.usedMemoryByte / (1024 * 1024)
                                             , (idxkeep.Length * 3)
                                             , ((double)iterinfo.numNonZeroBlock / idxremv.Length)
                                             );
                    }
                    GC.Collect();
                    if (process_disp_console)
                    {
                        System.Console.WriteLine(")");
                    }
                }

                int numca = H.ColBlockSize - lstNewIdxRemv.HListCount().Sum();

                //System.Console.WriteLine("finish coarse-graining");
                {
                    int[] idxkeep = HEnum.HEnumCount(numca).ToArray();
                    H = H.SubMatrixByAtoms(false, idxkeep, idxkeep, false);
                }
                {
                    H.MakeNearZeroBlockAsZero(thres_zeroblk);
                }
                GC.Collect();
                //System.Console.WriteLine("finish resizing");

                return(new CGetHessCoarseResiIterImpl
                {
                    iterinfos = iterinfos,
                    H = H,
                });
            }
                public static CGetHessCoarseResiIterImpl Do
                    (object[] atoms
                    , HessMatrix H
                    , List <int>[] lstNewIdxRemv
                    , double thres_zeroblk
                    , ILinAlg ila
                    , bool cloneH
                    , string[] options
                    )
                {
                    //HDebug.ToDo();

                    ila    = null;
                    cloneH = true;
                    if (cloneH)
                    {
                        H = H.CloneHess();
                    }

                    bool process_disp_console = true;

                    if (options != null && options.Contains("print process"))
                    {
                        process_disp_console = true;
                    }

                    bool parallel = false;

                    /// keep only lower triangle of H (lower block triangles)
                    {
                        HashSet <Tuple <int, int, MatrixByArr> > lstUppTrig = new HashSet <Tuple <int, int, MatrixByArr> >();
                        foreach (ValueTuple <int, int, MatrixByArr> bc_br_bval in H.EnumBlocks())
                        {
                            int bc = bc_br_bval.Item1;
                            int br = bc_br_bval.Item2;
                            if (bc < br)
                            {
                                lstUppTrig.Add(bc_br_bval.ToTuple());
                            }
                        }
                        foreach (Tuple <int, int, MatrixByArr> bc_br_bval in lstUppTrig)
                        {
                            int bc = bc_br_bval.Item1;
                            int br = bc_br_bval.Item2;
                            HDebug.Assert(bc < br);
                            H.SetBlock(bc, br, null);
                        }
                    }
                    GC.Collect();

                    DateTime[] process_time = new DateTime[6];

                    //System.Console.WriteLine("begin coarse-graining");
                    List <HessCoarseResiIterInfo> iterinfos = new List <HessCoarseResiIterInfo>();

                    for (int iter = lstNewIdxRemv.Length - 1; iter >= 0; iter--)
                    {
                        bool lprocess_disp_console = (process_disp_console && iter % 5 == 0);
                        lprocess_disp_console = true;
                        if (lprocess_disp_console)
                        {
                            process_time[0] = DateTime.UtcNow;
                            System.Console.Write(" - {0:000} : ", iter);
                        }

                        //int[] ikeep = lstNewIdxRemv[iter].Item1;

                        HessCoarseResiIterInfo iterinfo = new HessCoarseResiIterInfo();
                        iterinfo.sizeHessBlkMat  = 1;
                        iterinfo.numAtomsRemoved = 1;
                        iterinfo.time0           = DateTime.UtcNow;
                        int _count_update = 0;
                        {
                            HDebug.Assert(lstNewIdxRemv[iter].Count == 1);
                            int iremv = lstNewIdxRemv[iter][0];

                            HessMatrix         A         = H;
                            MatrixByArr        D         = null;
                            double             D_absmin  = 0;
                            List <int>         C_lstbr   = new List <int>();
                            List <MatrixByArr> C_lstbval = new List <MatrixByArr>();
                            {
                                // get C and D
                                foreach (var(bc, br, bval) in H.EnumBlocksInCols(new int[] { iremv }))
                                {
                                    HDebug.Assert(iremv == bc);
                                    if (bc == br)
                                    {
                                        HDebug.Assert(D == null);
                                        D        = bval;
                                        D_absmin = D.HAbsMin();
                                    }
                                    else
                                    {
                                        if (bval.HAbsMin() >= thres_zeroblk)
                                        {
                                            C_lstbr.Add(br);
                                            C_lstbval.Add(bval);
                                        }
                                    }
                                }
                                // remove C and D
                                {
                                    int bc = iremv;
                                    H.SetBlock(bc, bc, null);
                                    foreach (int br in C_lstbr)
                                    {
                                        H.SetBlock(bc, br, null);
                                    }
                                }
                            }
                            if (lprocess_disp_console)
                            {
                                process_time[1] = process_time[2] = DateTime.UtcNow;
                                System.Console.Write("CD({0:00.00} min), ", (process_time[2] - process_time[0]).TotalMinutes);
                            }

                            double threshold = thres_zeroblk / lstNewIdxRemv.Length;

                            //  DD ={ { d00,d01,d02},{ d10,d11,d12},{ d20,d21,d22} }; MatrixForm[DD]
                            //  BB ={ { b00,b01,b02},{ b10,b11,b12},{ b20,b21,b22} }; MatrixForm[BB]
                            //  CC ={ { c00,c01,c02},{ c10,c11,c12},{ c20,c21,c22} }; MatrixForm[CC]
                            //  object[]    dbginfo = null; // new object[] { iremv, atoms, H, D, C_lstbr, C_lstbval };

                            Action <ValueTuple <int, int, MatrixByArr, MatrixByArr> > Update_A_B_invD_C = delegate(ValueTuple <int, int, MatrixByArr, MatrixByArr> info)
                            {
                                int         bc = info.Item1; // bc
                                int         br = info.Item2; // br
                                MatrixByArr DC = info.Item3; // invDD_CC  // XX ={ { x00,x01,x02},{ x10,x11,x12},{ x20,x21,x22} }; MatrixForm[CC]
                                MatrixByArr B  = info.Item4; // BB        // BB ={ { b00,b01,b02},{ b10,b11,b12},{ b20,b21,b22} }; MatrixForm[BB]
                                //var _iremv                      = (int)dbginfo[0];
                                //var _atoms                      = dbginfo[1] as Universe.Atom[]  ;
                                //var _H                          = dbginfo[2] as HessMatrix       ;
                                //var _D                          = dbginfo[3] as MatrixByArr      ;
                                //var _C_lstbr                    = dbginfo[4] as List<int>        ;
                                //var _C_lstbval                  = dbginfo[5] as List<MatrixByArr>;

                                //MatrixByArr BB_invDD_CC = BB * invDD_CC;
                                double _BDC00 = 0 - B[0, 0] * DC[0, 0] - B[0, 1] * DC[1, 0] - B[0, 2] * DC[2, 0]; // { { b00 x00 +b01 x10 + b02 x20
                                double _BDC01 = 0 - B[0, 0] * DC[0, 1] - B[0, 1] * DC[1, 1] - B[0, 2] * DC[2, 1]; //   , b00 x01 +b01 x11 + b02 x21
                                double _BDC02 = 0 - B[0, 0] * DC[0, 2] - B[0, 1] * DC[1, 2] - B[0, 2] * DC[2, 2]; //   , b00 x02 +b01 x12 + b02 x22
                                double _BDC10 = 0 - B[1, 0] * DC[0, 0] - B[1, 1] * DC[1, 0] - B[1, 2] * DC[2, 0]; // },{ b10 x00 +b11 x10 + b12 x20
                                double _BDC11 = 0 - B[1, 0] * DC[0, 1] - B[1, 1] * DC[1, 1] - B[1, 2] * DC[2, 1]; //   , b10 x01 +b11 x11 + b12 x21
                                double _BDC12 = 0 - B[1, 0] * DC[0, 2] - B[1, 1] * DC[1, 2] - B[1, 2] * DC[2, 2]; //   , b10 x02 +b11 x12 + b12 x22
                                double _BDC20 = 0 - B[2, 0] * DC[0, 0] - B[2, 1] * DC[1, 0] - B[2, 2] * DC[2, 0]; // },{ b20 x00 +b21 x10 + b22 x20
                                double _BDC21 = 0 - B[2, 0] * DC[0, 1] - B[2, 1] * DC[1, 1] - B[2, 2] * DC[2, 1]; //   , b20 x01 +b21 x11 + b22 x21
                                double _BDC22 = 0 - B[2, 0] * DC[0, 2] - B[2, 1] * DC[1, 2] - B[2, 2] * DC[2, 2]; //   , b20 x02 +b21 x12 + b22 x22 }}

                                if (A.HasBlockLock(bc, br))
                                {
                                    MatrixByArr A_bc_br = A.GetBlockLock(bc, br);
                                    A_bc_br[0, 0] += _BDC00; // A = A + (-B.invD.C)
                                    A_bc_br[0, 1] += _BDC01; // A = A + (-B.invD.C)
                                    A_bc_br[0, 2] += _BDC02; // A = A + (-B.invD.C)
                                    A_bc_br[1, 0] += _BDC10; // A = A + (-B.invD.C)
                                    A_bc_br[1, 1] += _BDC11; // A = A + (-B.invD.C)
                                    A_bc_br[1, 2] += _BDC12; // A = A + (-B.invD.C)
                                    A_bc_br[2, 0] += _BDC20; // A = A + (-B.invD.C)
                                    A_bc_br[2, 1] += _BDC21; // A = A + (-B.invD.C)
                                    A_bc_br[2, 2] += _BDC22; // A = A + (-B.invD.C)
                                    // (small && small && small) == !(large || large || large)
                                    bool toosmall = !(Math.Abs(A_bc_br[0, 0]) > threshold || Math.Abs(A_bc_br[0, 1]) > threshold || Math.Abs(A_bc_br[0, 2]) > threshold ||
                                                      Math.Abs(A_bc_br[1, 0]) > threshold || Math.Abs(A_bc_br[1, 1]) > threshold || Math.Abs(A_bc_br[1, 2]) > threshold ||
                                                      Math.Abs(A_bc_br[2, 0]) > threshold || Math.Abs(A_bc_br[2, 1]) > threshold || Math.Abs(A_bc_br[2, 2]) > threshold);
                                    if (toosmall)
                                    {
                                        HDebug.Assert(bc != br);
                                        A.SetBlockLock(bc, br, null);
                                    }
                                }
                                else
                                {
                                    // (small && small && small) == !(large || large || large)
                                    bool toosmall = !(Math.Abs(_BDC00) > threshold || Math.Abs(_BDC01) > threshold || Math.Abs(_BDC02) > threshold ||
                                                      Math.Abs(_BDC10) > threshold || Math.Abs(_BDC11) > threshold || Math.Abs(_BDC12) > threshold ||
                                                      Math.Abs(_BDC20) > threshold || Math.Abs(_BDC21) > threshold || Math.Abs(_BDC22) > threshold);
                                    if (!toosmall)
                                    {
                                        MatrixByArr A_bc_br = new double[3, 3]
                                        {
                                            { _BDC00, _BDC01, _BDC02 }   // A = 0 + (-B.invD.C)
                                            , { _BDC10, _BDC11, _BDC12 } // A = 0 + (-B.invD.C)
                                            , { _BDC20, _BDC21, _BDC22 } // A = 0 + (-B.invD.C)
                                        };
                                        A.SetBlockLock(bc, br, A_bc_br);
                                    }
                                }

                                System.Threading.Interlocked.Increment(ref _count_update);
                            };

                            var lstCompInfo = EnumComput(D, C_lstbr, C_lstbval, threshold);
                            if (parallel)
                            {
                                Parallel.ForEach(lstCompInfo, Update_A_B_invD_C);
                            }
                            else
                            {
                                foreach (var info in lstCompInfo)
                                {
                                    Update_A_B_invD_C(info);
                                }
                            }

                            //GC.Collect(0);

                            if (lprocess_disp_console)
                            {
                                process_time[4] = DateTime.UtcNow;
                                System.Console.Write("B.invD.C({0:00.00} min), ", (process_time[4] - process_time[3]).TotalMinutes);
                            }

                            H = A;
                        }
                        iterinfo.usedMemoryByte = GC.GetTotalMemory(false);
                        iterinfo.time1          = DateTime.UtcNow;
                        iterinfos.Add(iterinfo);

                        if (lprocess_disp_console)
                        {
                            System.Console.WriteLine("summary(makezero {0,5}, nonzero {1,5}, numIgnMul {2,7}, numRemvAtoms {3,3}, {4,5:0.00} sec, {5} mb, {6}x{6}, nzeroBlk/Atom {7:0.00}, cntUpdateBlk({8}))"
                                                     , iterinfo.numSetZeroBlock
                                                     , iterinfo.numNonZeroBlock
                                                     , iterinfo.numAddIgnrBlock
                                                     , iterinfo.numAtomsRemoved
                                                     , iterinfo.compSec
                                                     , iterinfo.usedMemoryByte / (1024 * 1024)
                                                     , (0 * 3)
                                                     , 0//((double)iterinfo.numNonZeroBlock / idxremv.Length)
                                                     , _count_update
                                                     );
                        }
                    }
                    int numca = H.ColBlockSize - lstNewIdxRemv.HListCount().Sum();

                    //System.Console.WriteLine("finish coarse-graining");
                    {
                        int[] idxkeep = HEnum.HEnumCount(numca).ToArray();
                        H = H.SubMatrixByAtoms(false, idxkeep, idxkeep, false);
                    }
                    {
                        H.MakeNearZeroBlockAsZero(thres_zeroblk);
                    }
                    GC.Collect(0);
                    //System.Console.WriteLine("finish resizing");

                    return(new CGetHessCoarseResiIterImpl
                    {
                        iterinfos = iterinfos,
                        H = H,
                    });
                }
            public static CGetHessCoarseResiIterImpl GetHessCoarseResiIterImpl_ILinAlg_20150329(HessMatrix H, List <int>[] lstNewIdxRemv, double thres_zeroblk, ILinAlg ila, bool cloneH)
            {
                if (cloneH)
                {
                    H = H.CloneHess();
                }

                //System.Console.WriteLine("begin coarse-graining");
                List <HessCoarseResiIterInfo> iterinfos = new List <HessCoarseResiIterInfo>();

                for (int iter = lstNewIdxRemv.Length - 1; iter >= 0; iter--)
                {
                    //int[] ikeep = lstNewIdxRemv[iter].Item1;
                    int[] iremv = lstNewIdxRemv[iter].ToArray();
                    HDebug.Assert(H.ColBlockSize == H.RowBlockSize);
                    int blksize = H.ColBlockSize;
                    //HDebug.Assert(ikeep.Max() < blksize);
                    //HDebug.Assert(iremv.Max() < blksize);
                    //HDebug.Assert(iremv.Max()+1 == blksize);
                    //HDebug.Assert(iremv.Max() - iremv.Min() + 1 == iremv.Length);

                    int[] idxkeep = HEnum.HEnumFromTo(0, iremv.Min() - 1).ToArray();
                    int[] idxremv = HEnum.HEnumFromTo(iremv.Min(), iremv.Max()).ToArray();
                    //HDebug.Assert(idxkeep.HUnionWith(idxremv).Length == blksize);

                    HessCoarseResiIterInfo iterinfo = new HessCoarseResiIterInfo();
                    iterinfo.sizeHessBlkMat  = idxremv.Max() + 1; // H.ColBlockSize;
                    iterinfo.numAtomsRemoved = idxremv.Length;
                    iterinfo.time0           = DateTime.UtcNow;
                    {
                        //HessMatrix    A = H.SubMatrixByAtoms(false, idxkeep, idxkeep);
                        HessMatrix A = H;
                        //HessMatrix    B = H.SubMatrixByAtoms(false, idxkeep, idxremv);
                        HessMatrix C    = H.SubMatrixByAtoms(false, idxremv, idxkeep);
                        HessMatrix D    = H.SubMatrixByAtoms(false, idxremv, idxremv);
                        HessMatrix invD = new HessMatrixDense {
                            hess = ila.InvSymm(D)
                        };

                        // make B,C sparse
                        //int B_cntzero = B.MakeNearZeroBlockAsZero(thres_zeroblk);
                        iterinfo.numSetZeroBlock = C.MakeNearZeroBlockAsZero(thres_zeroblk);
                        //int B_nzeros = B.NumUsedBlocks; double B_nzeros_ = Math.Sqrt(B_nzeros);
                        iterinfo.numNonZeroBlock = C.NumUsedBlocks;

                        HessMatrix B        = C.Tr();
                        HessMatrix B_invD_C = B * invD * C;
                        iterinfo.numAddIgnrBlock = A.UpdateAdd(B_invD_C, -1, null, thres_zeroblk / lstNewIdxRemv.Length);
                        //HessMatrix nH = A - B_invD_C;
                        //nH = ((nH + nH.Tr())/2).ToHessMatrix();
                        H = A;
                    }
                    iterinfo.usedMemoryByte = GC.GetTotalMemory(false);
                    iterinfo.time1          = DateTime.UtcNow;
                    iterinfos.Add(iterinfo);

                    //System.Console.WriteLine(" - {0:000} : makezero {1,5}, nonzero {2,5}, numIgnMul {3,7}, numRemvAtoms {4,3}, {5,5:0.00} sec, {6} mb, {7}x{7}"
                    //                        , iter
                    //                        , iterinfo.numSetZeroBlock
                    //                        , iterinfo.numNonZeroBlock
                    //                        , iterinfo.numAddIgnrBlock
                    //                        , iterinfo.numAtomsRemoved
                    //                        , iterinfo.compSec
                    //                        , iterinfo.usedMemoryByte/(1024*1024)
                    //                        , (idxkeep.Length*3)
                    //                        );

                    GC.Collect();
                }

                int numca = H.ColBlockSize - lstNewIdxRemv.HListCount().Sum();

                //System.Console.WriteLine("finish coarse-graining");
                {
                    int[] idxkeep = HEnum.HEnumCount(numca).ToArray();
                    H = H.SubMatrixByAtoms(false, idxkeep, idxkeep, false);
                }
                {
                    H.MakeNearZeroBlockAsZero(thres_zeroblk);
                }
                GC.Collect();
                //System.Console.WriteLine("finish resizing");

                return(new CGetHessCoarseResiIterImpl
                {
                    iterinfos = iterinfos,
                    H = H,
                });
            }
            public static CGetHessCoarseResiIterImpl GetHessCoarseResiIterImpl_ILinAlg(HessMatrix H, List <int>[] lstNewIdxRemv, double thres_zeroblk, ILinAlg ila, bool cloneH)
            {
                if (cloneH)
                {
                    H = H.CloneHess();
                }

                bool process_disp_console = true;

                DateTime[] process_time = new DateTime[7];

                //System.Console.WriteLine("begin coarse-graining");
                List <HessCoarseResiIterInfo> iterinfos = new List <HessCoarseResiIterInfo>();

                for (int iter = lstNewIdxRemv.Length - 1; iter >= 0; iter--)
                {
                    if (process_disp_console)
                    {
                        process_time[0] = DateTime.UtcNow; System.Console.Write(" - {0:000} : ", iter);
                    }

                    //int[] ikeep = lstNewIdxRemv[iter].Item1;
                    int[] iremv = lstNewIdxRemv[iter].ToArray();
                    HDebug.Assert(H.ColBlockSize == H.RowBlockSize);
                    int blksize = H.ColBlockSize;
                    //HDebug.Assert(ikeep.Max() < blksize);
                    //HDebug.Assert(iremv.Max() < blksize);
                    //HDebug.Assert(iremv.Max()+1 == blksize);
                    //HDebug.Assert(iremv.Max() - iremv.Min() + 1 == iremv.Length);

                    int[] idxkeep = HEnum.HEnumFromTo(0, iremv.Min() - 1).ToArray();
                    int[] idxremv = HEnum.HEnumFromTo(iremv.Min(), iremv.Max()).ToArray();
                    //HDebug.Assert(idxkeep.HUnionWith(idxremv).Length == blksize);

                    HessCoarseResiIterInfo iterinfo = new HessCoarseResiIterInfo();
                    iterinfo.sizeHessBlkMat  = idxremv.Max() + 1; // H.ColBlockSize;
                    iterinfo.numAtomsRemoved = idxremv.Length;
                    iterinfo.time0           = DateTime.UtcNow;
                    double C_density0 = double.NaN;
                    double C_density1 = double.NaN;
                    {
                        //HessMatrix    A = H.SubMatrixByAtoms(false, idxkeep, idxkeep);
                        HessMatrix A = H;
                        //HessMatrix    B = H.SubMatrixByAtoms(false, idxkeep, idxremv);
                        HessMatrix C = H.SubMatrixByAtoms(false, idxremv, idxkeep);                                      if (process_disp_console)
                        {
                            process_time[1] = DateTime.UtcNow; System.Console.Write("C({0:00.00} min), ", (process_time[1] - process_time[0]).TotalMinutes);
                        }
                        HessMatrix D = H.SubMatrixByAtoms(false, idxremv, idxremv);                                      if (process_disp_console)
                        {
                            process_time[2] = DateTime.UtcNow; System.Console.Write("D({0:00.00} min), ", (process_time[2] - process_time[1]).TotalMinutes);
                        }
                        HessMatrix invD = new HessMatrixDense {
                            hess = ila.InvSymm(D)
                        };                                      if (process_disp_console)
                        {
                            process_time[3] = DateTime.UtcNow; System.Console.Write("invD({0:00.00} min), ", (process_time[3] - process_time[2]).TotalMinutes);
                        }

                        // make B,C sparse
                        //int B_cntzero = B.MakeNearZeroBlockAsZero(thres_zeroblk);
                        C_density0 = C.RatioUsedBlocks;
                        iterinfo.numSetZeroBlock = C.MakeNearZeroBlockAsZero(thres_zeroblk);                                if (process_disp_console)
                        {
                            process_time[4] = DateTime.UtcNow; System.Console.Write("sparseC({0:00.00} min), ", (process_time[4] - process_time[3]).TotalMinutes);
                        }
                        //int B_nzeros = B.NumUsedBlocks; double B_nzeros_ = Math.Sqrt(B_nzeros);
                        iterinfo.numNonZeroBlock = C.NumUsedBlocks;
                        C_density1 = C.RatioUsedBlocks;

                        HessMatrix B        = C.Tr();
                        HessMatrix B_invD_C = HessMatrix.GetMul(ila, B, invD, C); /* B * invD * C;*/ if (process_disp_console)
                        {
                            process_time[5] = DateTime.UtcNow; System.Console.Write("B.invD.C({0:00.00} min), ", (process_time[5] - process_time[4]).TotalMinutes);
                        }
                        iterinfo.numAddIgnrBlock = A.UpdateAdd(B_invD_C, -1, null, thres_zeroblk / lstNewIdxRemv.Length);     if (process_disp_console)
                        {
                            process_time[6] = DateTime.UtcNow; System.Console.Write("A+BinvDC({0:00.00} min), ", (process_time[6] - process_time[5]).TotalMinutes);
                        }
                        //HessMatrix nH = A - B_invD_C;
                        //nH = ((nH + nH.Tr())/2).ToHessMatrix();
                        H = A;
                    }
                    iterinfo.usedMemoryByte = GC.GetTotalMemory(false);
                    iterinfo.time1          = DateTime.UtcNow;
                    iterinfos.Add(iterinfo);

                    if (process_disp_console)
                    {
                        System.Console.WriteLine("summary(makezero {0,5}, nonzero {1,5}, numIgnMul {2,7}, numRemvAtoms {3,3}, {4,5:0.00} sec, {5} mb, {6}x{6}, nzeroBlk/Atom {7:0.00})"
                                                 , iterinfo.numSetZeroBlock
                                                 , iterinfo.numNonZeroBlock
                                                 , iterinfo.numAddIgnrBlock
                                                 , iterinfo.numAtomsRemoved
                                                 , iterinfo.compSec
                                                 , iterinfo.usedMemoryByte / (1024 * 1024)
                                                 , (idxkeep.Length * 3)
                                                 , ((double)iterinfo.numNonZeroBlock / idxremv.Length)
                                                 );
                    }

                    GC.Collect(0);
                }

                int numca = H.ColBlockSize - lstNewIdxRemv.HListCount().Sum();

                //System.Console.WriteLine("finish coarse-graining");
                {
                    int[] idxkeep = HEnum.HEnumCount(numca).ToArray();
                    H = H.SubMatrixByAtoms(false, idxkeep, idxkeep, false);
                }
                {
                    H.MakeNearZeroBlockAsZero(thres_zeroblk);
                }
                GC.Collect(0);
                //System.Console.WriteLine("finish resizing");

                return(new CGetHessCoarseResiIterImpl
                {
                    iterinfos = iterinfos,
                    H = H,
                });
            }
示例#5
0
            public static CGetHessCoarseResiIterImpl GetHessCoarseResiIterImpl_Matlab(HessMatrix H, List <int>[] lstNewIdxRemv, double thres_zeroblk)
            {
                HessMatrix CGH = null;
                List <HessCoarseResiIterInfo> iterinfos = new List <HessCoarseResiIterInfo>();

                using (new Matlab.NamedLock("CGHessIter"))
                {
                    Matlab.PutSparseMatrix("CG.H", H.GetMatrixSparse(), 3, 3);
                    Matlab.PutValue("CG.th", thres_zeroblk);
                    Matlab.PutValue("CG.iter", lstNewIdxRemv.Length);
                    for (int iter = lstNewIdxRemv.Length - 1; iter >= 0; iter--)
                    {
                        int[] iremv   = lstNewIdxRemv[iter].ToArray();
                        int[] idxkeep = HEnum.HEnumFromTo(0, iremv.Min() - 1).ToArray();
                        int[] idxremv = HEnum.HEnumFromTo(iremv.Min(), iremv.Max()).ToArray();
                        Matlab.PutVector("CG.idxkeep", idxkeep);
                        Matlab.PutVector("CG.idxremv", idxremv);
                        Matlab.Execute("CG.idxkeep = sort([CG.idxkeep*3+1; CG.idxkeep*3+2; CG.idxkeep*3+3]);");
                        Matlab.Execute("CG.idxremv = sort([CG.idxremv*3+1; CG.idxremv*3+2; CG.idxremv*3+3]);");

                        HessCoarseResiIterInfo iterinfo = new HessCoarseResiIterInfo();
                        iterinfo.sizeHessBlkMat  = idxremv.Max() + 1; // H.ColBlockSize;
                        iterinfo.numAtomsRemoved = idxremv.Length;
                        iterinfo.idxkeep         = idxkeep.HClone();
                        iterinfo.idxremv         = idxremv.HClone();
                        iterinfo.time0           = DateTime.UtcNow;

                        if (HDebug.IsDebuggerAttached)
                        {
                            int maxkeep = Matlab.GetValueInt("max(CG.idxkeep)");
                            int minremv = Matlab.GetValueInt("min(CG.idxremv)");
                            HDebug.Assert(maxkeep + 1 == minremv);
                            int maxremv = Matlab.GetValueInt("max(CG.idxremv)");
                            int Hsize   = Matlab.GetValueInt("max(size(CG.H))");
                            HDebug.Assert(Hsize == maxremv);
                            int idxsize = Matlab.GetValueInt("length(union(CG.idxkeep,CG.idxremv))");
                            HDebug.Assert(Hsize == idxsize);
                        }
                        Matlab.Execute("CG.A = CG.H(CG.idxkeep, CG.idxkeep);");
                        Matlab.Execute("CG.B = CG.H(CG.idxkeep, CG.idxremv);");
                        //Matlab.Execute("CG.C = CG.H(CG.idxremv, CG.idxkeep);");
                        Matlab.Execute("CG.D = CG.H(CG.idxremv, CG.idxremv);");
                        HDebug.Assert(false);
                        Matlab.Execute("CG.B(abs(CG.B) < CG.th) = 0;");     /// matlab cannot handle this call. Matlab try to use 20G memory.
                        Matlab.Execute("CG.BDC = CG.B * inv(full(CG.D)) * CG.B';");
                        Matlab.Execute("CG.BDC = sparse(CG.BDC);");
                        Matlab.Execute("CG.BDC(abs(CG.BDC) < (CG.th / CG.iter)) = 0;");
                        Matlab.Execute("CG.H = CG.A - sparse(CG.BDC);");

                        iterinfo.numSetZeroBlock = -1;
                        iterinfo.numNonZeroBlock = -1;
                        iterinfo.numAddIgnrBlock = -1;
                        iterinfo.usedMemoryByte  = -1;
                        iterinfo.time1           = DateTime.UtcNow;
                        iterinfos.Add(iterinfo);

                        System.Console.WriteLine(" - {0:000} : makezero {1,5}, nonzero {2,5}, numIgnMul {3,7}, numRemvAtoms {4,3}, {5,5:0.00} sec, {6} mb, {7}x{7}"
                                                 , iter
                                                 , iterinfo.numSetZeroBlock
                                                 , iterinfo.numNonZeroBlock
                                                 , iterinfo.numAddIgnrBlock
                                                 , iterinfo.numAtomsRemoved
                                                 , iterinfo.compSec
                                                 , iterinfo.usedMemoryByte / (1024 * 1024)
                                                 , (idxkeep.Length * 3)
                                                 );
                    }
                    Matrix CG_H = Matlab.GetMatrix("CG.H");
                    CGH = new HessMatrixDense {
                        hess = CG_H
                    };
                }

                return(new CGetHessCoarseResiIterImpl
                {
                    iterinfos = iterinfos,
                    H = CGH,
                });
            }
示例#6
0
            public static CGetHessCoarseResiIterImpl GetHessCoarseResiIterImpl_Matlab_experimental
                (object[] atoms
                , HessMatrix H
                , List <int>[] lstNewIdxRemv
                , double thres_zeroblk
                , ILinAlg ila
                , bool cloneH
                , string[] options
                )
            {
                ila = null;
                if (cloneH)
                {
                    H = H.CloneHess();
                }

                bool process_disp_console = true;

                if (options != null && options.Contains("print process"))
                {
                    process_disp_console = true;
                }

                bool parallel = true;

                GC.Collect(0);

                DateTime[] process_time = new DateTime[6];

                //System.Console.WriteLine("begin coarse-graining");
                List <HessCoarseResiIterInfo> iterinfos = new List <HessCoarseResiIterInfo>();

                for (int iter = lstNewIdxRemv.Length - 1; iter >= 0; iter--)
                {
                    if (process_disp_console)
                    {
                        process_time[0] = DateTime.UtcNow;
                        System.Console.Write(" - {0:000} : ", iter);
                    }

                    //int[] ikeep = lstNewIdxRemv[iter].Item1;
                    int[] iremv = lstNewIdxRemv[iter].ToArray();
                    HDebug.Assert(H.ColBlockSize == H.RowBlockSize);
                    int blksize = H.ColBlockSize;
                    //HDebug.Assert(ikeep.Max() < blksize);
                    //HDebug.Assert(iremv.Max() < blksize);
                    //HDebug.Assert(iremv.Max()+1 == blksize);
                    //HDebug.Assert(iremv.Max() - iremv.Min() + 1 == iremv.Length);

                    int[] idxkeep = HEnum.HEnumFromTo(0, iremv.Min() - 1).ToArray();
                    int[] idxremv = HEnum.HEnumFromTo(iremv.Min(), iremv.Max()).ToArray();
                    //HDebug.Assert(idxkeep.HUnionWith(idxremv).Length == blksize);

                    HessCoarseResiIterInfo iterinfo = new HessCoarseResiIterInfo();
                    iterinfo.sizeHessBlkMat  = idxremv.Max() + 1; // H.ColBlockSize;
                    iterinfo.numAtomsRemoved = idxremv.Length;
                    iterinfo.time0           = DateTime.UtcNow;
                    double C_density0 = double.NaN;
                    double C_density1 = double.NaN;
                    {
                        //HessMatrix    A = H.SubMatrixByAtoms(false, idxkeep, idxkeep);
                        HessMatrix A = H;
                        //HessMatrix    B = H.SubMatrixByAtoms(false, idxkeep, idxremv);

                        HessMatrix C, D;
                        /// HessMatrix    C = H.SubMatrixByAtoms(false, idxremv, idxkeep, parallel:parallel);
                        /// HessMatrix    D = H.SubMatrixByAtoms(false, idxremv, idxremv, parallel:parallel);
                        {
                            C = H.Zeros(idxremv.Length * 3, idxkeep.Length * 3);
                            D = H.Zeros(idxremv.Length * 3, idxremv.Length * 3);
                            int iremv_min = iremv.Min();
                            int iremv_max = iremv.Max();

                            foreach (var bc_br_bval in H.EnumBlocksInCols(idxremv))
                            {
                                int bc   = bc_br_bval.Item1;
                                int br   = bc_br_bval.Item2;
                                var bval = bc_br_bval.Item3;


                                if (bc > iremv_max)
                                {
                                    continue;
                                }
                                if (br > iremv_max)
                                {
                                    continue;
                                }
                                if (br < iremv_min)
                                {
                                    int nc = bc - iremv_min;
                                    int nr = br;
                                    C.SetBlock(nc, nr, bval.CloneT());
                                }
                                else
                                {
                                    int nc = bc - iremv_min;
                                    int nr = br - iremv_min;
                                    D.SetBlock(nc, nr, bval.CloneT());
                                }
                            }
                        }
                        if (process_disp_console)
                        {
                            process_time[1] = process_time[2] = DateTime.UtcNow;
                            System.Console.Write("CD({0:00.00} min), ", (process_time[2] - process_time[0]).TotalMinutes);
                        }

                        // make B,C sparse
                        //int B_cntzero = B.MakeNearZeroBlockAsZero(thres_zeroblk);
                        C_density0 = C.RatioUsedBlocks;
                        /// iterinfo.numSetZeroBlock = C.MakeNearZeroBlockAsZero(thres_zeroblk);
                        {
                            double thres_absmax = thres_zeroblk;

                            List <Tuple <int, int> > lstIdxToMakeZero = new List <Tuple <int, int> >();
                            foreach (var bc_br_bval in C.EnumBlocks())
                            {
                                int    bc          = bc_br_bval.Item1;
                                int    br          = bc_br_bval.Item2;
                                var    bval        = bc_br_bval.Item3;
                                double absmax_bval = bval.HAbsMax();
                                if (absmax_bval < thres_absmax)
                                {
                                    lstIdxToMakeZero.Add(new Tuple <int, int>(bc, br));
                                }
                            }
                            foreach (var bc_br in lstIdxToMakeZero)
                            {
                                int cc   = bc_br.Item1;
                                int cr   = bc_br.Item2;
                                var Cval = C.GetBlock(cc, cr);
                                C.SetBlock(cc, cr, null);
                                var Dval = D.GetBlock(cc, cc);              // nCval = Cval    -Cval
                                D.SetBlock(cc, cc, Dval + Cval);            // nDval = Dval - (-Cval) = Dval + Cval
                                int bc   = cr;
                                int br   = cc;
                                var Bval = Cval.Tr();
                                var Aval = A.GetBlock(bc, bc);              // nBval = Bval    -Bval
                                A.SetBlock(bc, bc, Aval + Bval);            // nAval = Aval - (-Bval) = Aval + Bval
                            }
                            iterinfo.numSetZeroBlock = lstIdxToMakeZero.Count;
                        }
                        //int B_nzeros = B.NumUsedBlocks; double B_nzeros_ = Math.Sqrt(B_nzeros);
                        iterinfo.numNonZeroBlock = C.NumUsedBlocks;
                        C_density1 = C.RatioUsedBlocks;


                        HessMatrix B_invD_C = Get_BInvDC(A, C, D, process_disp_console
                                                         , options
                                                         , parallel: parallel
                                                         );
                        if (process_disp_console)
                        {
                            process_time[4] = DateTime.UtcNow;
                            System.Console.Write("B.invD.C({0:00.00} min), ", (process_time[4] - process_time[3]).TotalMinutes);
                        }

                        /// iterinfo.numAddIgnrBlock = A.UpdateAdd(B_invD_C, -1, null, thres_zeroblk/lstNewIdxRemv.Length, parallel:parallel);
                        {
                            HessMatrix _this = A;
                            HessMatrix other = B_invD_C;
                            double     thres_NearZeroBlock = thres_zeroblk / lstNewIdxRemv.Length;

                            int count         = 0;
                            int count_ignored = 0;
                            foreach (var bc_br_bval in other.EnumBlocks())
                            {
                                count++;
                                int         bc         = bc_br_bval.Item1;
                                int         br         = bc_br_bval.Item2;
                                MatrixByArr other_bmat = bc_br_bval.Item3;
                                if (other_bmat.HAbsMax() <= thres_NearZeroBlock)
                                {
                                    // other_bmat = other_bmat    -other_bmat;
                                    // other_diag = other_diag - (-other_bmat) = other_diag + other_bmat;
                                    //  this_diag =  this_diat - B_invD_C
                                    //            =  this_diat - other_diag
                                    //            =  this_diat - (other_diag + other_bmat)
                                    //            =  this_diat - other_diag  - other_bmat
                                    //            = (this_diat - other_bmat) - other_diag
                                    //            = (this_diat - other_bmat) - (processed later)
                                    //            = (this_diat - other_bmat)
                                    MatrixByArr this_diag = _this.GetBlock(bc, bc);
                                    MatrixByArr new_diag  = this_diag - other_bmat;
                                    _this.SetBlock(bc, bc, new_diag);
                                    other_bmat = null;
                                    count_ignored++;
                                }
                                if (other_bmat != null)
                                {
                                    MatrixByArr this_bmat = _this.GetBlock(bc, br);
                                    MatrixByArr new_bmat  = this_bmat - other_bmat;
                                    _this.SetBlock(bc, br, new_bmat);
                                }
                            }
                            iterinfo.numAddIgnrBlock = count_ignored;
                        }
                        //HessMatrix nH = A - B_invD_C;
                        //nH = ((nH + nH.Tr())/2).ToHessMatrix();
                        H = A;
                    }
                    iterinfo.usedMemoryByte = GC.GetTotalMemory(false);
                    iterinfo.time1          = DateTime.UtcNow;
                    iterinfos.Add(iterinfo);

                    if (process_disp_console)
                    {
                        System.Console.WriteLine("summary(makezero {0,5}, nonzero {1,5}, numIgnMul {2,7}, numRemvAtoms {3,3}, {4,5:0.00} sec, {5} mb, {6}x{6}, nzeroBlk/Atom {7:0.00})"
                                                 , iterinfo.numSetZeroBlock
                                                 , iterinfo.numNonZeroBlock
                                                 , iterinfo.numAddIgnrBlock
                                                 , iterinfo.numAtomsRemoved
                                                 , iterinfo.compSec
                                                 , iterinfo.usedMemoryByte / (1024 * 1024)
                                                 , (idxkeep.Length * 3)
                                                 , ((double)iterinfo.numNonZeroBlock / idxremv.Length)
                                                 );
                    }

                    GC.Collect(0);
                }

                int numca = H.ColBlockSize - lstNewIdxRemv.HListCount().Sum();

                //System.Console.WriteLine("finish coarse-graining");
                {
                    int[] idxkeep = HEnum.HEnumCount(numca).ToArray();
                    H = H.SubMatrixByAtoms(false, idxkeep, idxkeep, false);
                }
                {
                    H.MakeNearZeroBlockAsZero(thres_zeroblk);
                }
                GC.Collect(0);
                //System.Console.WriteLine("finish resizing");

                return(new CGetHessCoarseResiIterImpl
                {
                    iterinfos = iterinfos,
                    H = H,
                });
            }