const Ring /* or null */ *IM2_Ring_localization(const Ring *R, Computation *C)
{
try
{
const PolyRing *PR = R->cast_to_PolyRing(); // FIXME should this get a PolyRing or Ring?
GBComputation *P = C->cast_to_GBComputation();
if (PR == nullptr)
{
ERROR("expected a polynomial ring");
return nullptr;
}
if (P == nullptr)
{
ERROR("expected a Grobner basis computation");
return nullptr;
}
if (P->get_ring() != PR)
{
ERROR("expected matrix to be over the same ring");
return nullptr;
}
return LocalRing::create(PR, P);
} catch (exc::engine_error e)
{
ERROR(e.what());
return NULL;
}
}
extern "C" void remove_gb(void *p, void *cd)
{
GBComputation *G = static_cast<GBComputation *>(p);
AO_t nremoved = AO_fetch_and_add1(&gbs_nremoved);
if (M2_gbTrace >= 3)
fprintf(stderr, "\n --removing gb %zd at %p\n", nremoved, G);
G->remove_gb();
}
const Matrix /* or null */ *
rawGBGetParallelLeadTerms(Computation *C, M2_arrayint w)
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->get_parallel_lead_terms(w);
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
const Matrix /* or null */ *
rawGBGetLeadTerms(Computation *C, int nparts)
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->get_initial(nparts);
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
int
IM2_GB_contains(Computation *C,
const Matrix *m)
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->contains(m);
ERROR("computation type unknown or not implemented");
return -2;
}
catch (exc::engine_error e) {
ERROR(e.what());
return -2;
}
}
const Matrix /* or null */ *
rawGBMatrixRemainder(Computation *C,
const Matrix *m)
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->matrix_remainder(m);
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
const Matrix /* or null */ *rawGBGetMatrix(Computation *C)
/* Get the minimal, auto-reduced GB of a GB computation.
Each call to this will produce a different raw matrix */
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->get_gb();
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
M2_bool IM2_GB_matrix_lift(Computation *C,
const Matrix *m,
const Matrix /* or null */ **result_remainder,
const Matrix /* or null */ **result_quotient
)
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->matrix_lift(m, result_remainder, result_quotient);
else ERROR("computation type unknown or not implemented");
}
catch (exc::engine_error e) {
ERROR(e.what());
}
return false;
}
const Matrix /* or null */ *rawGBMinimalGenerators(Computation *C)
/* Yields a matrix whose columns form a minimal generating set
for the ideal or submodule, as computed so far. In the
inhomogeneous case, this yields a generating set which is
sometimes smaller than the entire Groebner basis. */
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->get_mingens();
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
const Matrix /* or null */ *rawGBSyzygies(Computation *C)
/* Yields a matrix containing the syzygies computed so far
via the GB computation C, assuming that 'collect_syz' was
set when the computation was created. If 'n_rows_to_keep' was
set to a non-negative integer, then only that many rows of each
syzygy are kept. */
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->get_syzygies();
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
const Matrix /* or null */ *rawGBChangeOfBasis(Computation *C)
/* Yields the change of basis matrix from the Groebner basis to
the original generators, at least if n_rows_to_keep was set
when creating the GB computation. This matrix, after the
computation has run to completion, should satisfy:
(original matrix) = (GB matrix) * (change of basis matrix). */
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G != 0)
return G->get_change();
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
Computation /* or null */ *
IM2_GB_set_hilbert_function(Computation *C,
const RingElement *h)
{
try {
clear_emit_size();
GBComputation *G = C->cast_to_GBComputation();
if (G->get_ring()->get_degree_ring() != h->get_ring())
{
ERROR("expected Hilbert function hint to be in correct degree ring");
return 0;
}
if (G != 0)
return G->set_hilbert_function(h);
ERROR("computation type unknown or not implemented");
return 0;
}
catch (exc::engine_error e) {
ERROR(e.what());
return NULL;
}
}
virtual void text_out(buffer &o) const { G->text_out(o); }
virtual void show() const { G->show(); }
virtual M2_bool matrix_lift(const Matrix *m,
const Matrix /* or null */ **result_remainder,
const Matrix /* or null */ **result_quotient) {
return G->matrix_lift(m,result_remainder,result_quotient);
}
virtual int contains(const Matrix *m) { return G->contains(m); }
virtual const Matrix /* or null */ *get_parallel_lead_terms(M2_arrayint w) { return G->get_parallel_lead_terms(w); }
virtual const Matrix /* or null */ *matrix_remainder(const Matrix *m) {
return G->matrix_remainder(m);
}
virtual const Matrix /* or null */ *get_syzygies() { return G->get_syzygies(); }
virtual Computation /* or null */ *set_hilbert_function(const RingElement *h)
{ return G->set_hilbert_function(h); }
virtual const Matrix /* or null */ *get_mingens() { return G->get_mingens(); }
virtual const Matrix /* or null */ *get_change() { return G->get_change(); }
////////////////////////////////
// Results of the computation //
////////////////////////////////
virtual const Matrix /* or null */ *get_gb() { return G->get_gb(); }
virtual int complete_thru_degree() const { return G->complete_thru_degree(); }
GBComputation *replace_GB(GBComputation *G0) {
GBComputation *result = G;
set_status(G->status());
G = G0;
return result;
}
virtual bool stop_conditions_ok() {
G->stop_ = stop_;
return G->stop_conditions_ok(); }
virtual const Matrix /* or null */ *get_initial(int nparts) { return G->get_initial(nparts); }
virtual void start_computation() { G->start_computation(); set_status(G->status()); }
virtual const Ring * get_ring() const { return G->get_ring(); }
