mult()

Matrix * Matrix::mult	(	const Matrix *	m,
		bool	opposite_mult ) const

Definition at line 659 of file matrix.cpp.

{
  const Ring *R = get_ring();
  if (R != m->get_ring())
    {
      ERROR("matrix mult: different base rings");
      return nullptr;
    }
  if (n_cols() != m->n_rows())
    {
      ERROR("matrix mult: matrix sizes don't match");
      return nullptr;
    }
 
  auto D = R->degree_monoid();
  monomial deg = D->make_new(degree_shift());
  D->mult(deg, m->degree_shift(), deg);
 
  MatrixConstructor mat(rows(), m->cols(), deg);
 
  D->remove(deg);
 
  for (int i = 0; i < m->n_cols(); i++)
    mat.set_column(i, R->mult_vec_matrix(this, m->elem(i), opposite_mult));
  return mat.to_matrix();
}

References cols(), Ring::degree_monoid(), degree_shift(), elem(), ERROR, get_ring(), Matrix(), MatrixConstructor, monomial, mult(), Ring::mult_vec_matrix(), n_cols(), n_rows(), rows(), MatrixConstructor::set_column(), and MatrixConstructor::to_matrix().

Referenced by mult().