WARNING THIS IS STILL A PRELIMINARY IMPLEMENTATION as indicated by
the names of the implementation files: TmpPPVector.H and TmpPPVector.C.
This class is for dealing with lists of power-products.
This class has been designed to be used by monomial ideal operations, Hilbert, and Mayer-Vietoris trees.
The key functions interpret the list as generators of a monomial ideal: interreduction, divisibility test (ideal membership), lcms (ideal intersection).
The elements are PPWithMask, to make fast divisibility tests.
Constructor requires a PPMonoid and a DivMaskRule (see
DivMask), so that the user can choose the best suited
implementations (mostly depending on the number of indeterminates and
on the size of the exponents).
Member fields are
PPMonoid myPPM;
DivMaskRule myDMR;
std::vector<PPWithMask> myVec;
PPVector(PPMonoid PPM, DivMaskRule DMR);
PPVector(PPMonoid PPM, DivMaskRule DMR, const std::vector<RingElem>& v);
bool IsEmpty(const PPVector& PPs)
bool IsDivisible(const PPWithMask& pp, const PPVector& ByL);
true iff pp is divisible by an element of L
bool IsDivisible(ConstRefPPMonoidElem pp, const PPVector& ByL);
true iff pp is divisible by an element of L
void interreduce(PPVector& PPs);
interreduce PPs (NOT exception clean)
void InterreduceSort(PPVector& PPs);
interreduce and sort PPs (NOT exception clean)
void lcms(PPVector& PPs, const PPVector& PPs1, const PPVector& PPs2);
all the lcm between elements of PPs1 and PPs2, effectively the
generators of the intersection ideal
PPMonoid PPM(const PPVector& PPs)
DivMaskRule DMR(const PPVector& PPs)
std::ostream& operator<<(std::ostream&, PPVector)
long len(const PPVector& PPs)
void convert(std::vector<RingElem>& v, ring P, const PPVector& PPs)
converts PP's into RingElem's
void convert(PPVector PPs, const std::vector<RingElem>& v)
converts vector<RingElem> (if monomial!) into PPVector
void PushBack(PPVector& PPs, ConstRefPPMonoidElem pp)
if owner(pp) != PPM(PPs) it maps it
void PushBackPopBack(PPVector& ToPPs, PPVector& FromPPs)
move last PP from FromPPs into ToPPs
void swap(PPVector& PPs1, PPVector& PPs2)
swap PPs1 and PPs1
There was an attempt to make it an abstract class, PPVectorBase, made
of abstract PPVectorElem, with the plan to have concrete classes a
vector of PPWithMask, of PPMonoidElem, and of square-free pps
(which cannot make a PPMonoid because x*x is not square-free).
But this failed because most operations would need to know the type of the elements in the vector making it more suitable for templates. But
So it was sadly abandoned.
2019