public LinearSolverLu_DDRM(LUDecompositionBase_DDRM decomp, bool doImprove) : base(decomp)
 {
     this.doImprove = doImprove;
 }
 protected LinearSolverLuBase_DDRM(LUDecompositionBase_DDRM decomp)
 {
     this.decomp = decomp;
 }
 public LinearSolverLu_DDRM(LUDecompositionBase_DDRM decomp) : base(decomp)
 {
 }