public VectorSparse <T> GetSubVectorExcept(int idxremove)
{
VectorSparse <T> subvec = new VectorSparse <T>(Size - 1, this.GetDefault);
foreach (var i_val in EnumElements())
{
int i = i_val.Item1; if (i == idxremove)
{
continue;
}
T val = i_val.Item2;
int si = (i < idxremove) ? i : (i - 1);
subvec[si] = val;
}
return(subvec);
}
public VectorSparse <T> GetRowVector(int col)
{
HDebug.AssertAnd(0 <= col, col < RowSize);
VectorSparse <T> vec = new VectorSparse <T>(RowSize, GetDefault: GetDefault);
if (diagonal[col] != null)
{
vec[col] = diagonal[col];
}
foreach (var r_val in offdiagonal[col])
{
int r = r_val.Key;
T val = r_val.Value;
vec[r] = val;
}
return(vec);
}
public VectorSparse <T> GetSubVector(IList <int> idxs)
{
VectorSparse <T> subvec = new VectorSparse <T>(idxs.Count, this.GetDefault);
Dictionary <int, int> idx_subidx = idxs.HToDictionaryAsValueIndex();
foreach (var i_val in EnumElements())
{
int i = i_val.Item1; if (idx_subidx.ContainsKey(i) == false)
{
continue;
}
T val = i_val.Item2;
int si = idx_subidx[i];
subvec[si] = val;
}
return(subvec);
}