submatrix method

Matrix submatrix(
  1. int i1,
  2. int j1,
  3. int i2,
  4. int j2,
)

Implementation

Matrix submatrix(int i1, int j1, int i2, int j2) {
  return Matrix.fromRows(this
      .rows
      .sublist(i1, i2)
      .map<Vector>((Vector row) => row.subvector(j1, j2))
      .toList());
}