public MatrixSparse <T> GetSubMatrixFromTo(int col_from, int col_to, int row_from, int row_to)
{
IList <int> colidxs = HEnum.HEnumFromTo(col_from, col_to).ToList();
IList <int> rowidxs = HEnum.HEnumFromTo(row_from, row_to).ToList();
return(GetSubMatrix(colidxs, rowidxs));
}
public IEnumerable <ValueTuple <int, int, T> > EnumElements()
{
int[] cols = HEnum.HEnumCount(ColSize).ToArray();
return(EnumElements(cols));
}
