sub_matrix() [1/2]

Matrix * Matrix::sub_matrix

(

M2_arrayint

c

)

const

Definition at line 505 of file matrix.cpp.

{
  const FreeModule *G = cols()->sub_space(c);
  if (G == nullptr) return nullptr;
 
  MatrixConstructor mat(rows(), G, degree_shift());
  for (unsigned int i = 0; i < c->len; i++)
    mat.set_column(i, get_ring()->copy_vec(elem(c->array[i])));
  return mat.to_matrix();
}

References cols(), degree_shift(), elem(), FreeModule, G, get_ring(), Matrix(), MatrixConstructor, rows(), MatrixConstructor::set_column(), sub_matrix(), and MatrixConstructor::to_matrix().