make_sparse() [1/2]

const Matrix * Matrix::make_sparse ( const FreeModule * target, const FreeModule * source, M2_arrayint deg, M2_arrayint rows, M2_arrayint cols, const engine_RawRingElementArray entries )

static

Definition at line 205 of file matrix.cpp.

{
#ifdef DEVELOPMENT
#warning "check that all rings are correct, give error otherwise"
#endif
  const Ring *R = target->get_ring();
  auto D = R->degree_monoid();
  monomial degshift = D->make_one();
  D->from_expvector(deg->array, degshift);
 
  MatrixConstructor mat(target, source, degshift);
  if (!Matrix::make_sparse_vecs(
          mat, target, source->rank(), rows, cols, entries))
    return nullptr;  // error message has already been sent
  return mat.to_matrix();
}

References cols(), Ring::degree_monoid(), FreeModule, FreeModule::get_ring(), make_sparse(), make_sparse_vecs(), Matrix(), MatrixConstructor, monomial, FreeModule::rank(), rows(), and MatrixConstructor::to_matrix().