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class tensor - apply permutation algebra

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Jiri Pittner
2024-05-03 13:57:11 +02:00
parent 3d8386e30a
commit 518c75fb20
3 changed files with 41 additions and 2 deletions
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8
tensor.h
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@@ -183,8 +183,12 @@ public:
void addcontraction(const Tensor &rhs1, int group, int index, const Tensor &rhs, int rhsgroup, int rhsindex, T alpha=1, T beta=1, bool doresize=false);
inline Tensor contraction(int group, int index, const Tensor &rhs, int rhsgroup, int rhsindex, T alpha=1) const {Tensor<T> r; r.addcontraction(*this,group,index,rhs,rhsgroup,rhsindex,alpha,0,true); return r; }
//@@@ general antisymmetrization operator Kucharski style - or that will be left to a code generator?
//@@@symmetrize a group, antisymmetrize a group, expand a (anti)symmetric group - obecne symmetry change krome +1 na -1 vse mozne
void apply_permutation_algebra(const Tensor &rhs, const PermutationAlgebra<int,T> &pa, bool inverse=false, T alpha=1, T beta=0); //general (not optimally efficient) symmetrizers, antisymmetrizers etc. acting on the flattened index list:
// this *=beta; for I over this: this(I) += alpha * sum_P c_P rhs(P(I))
// PermutationAlgebra can represent e.g. general_antisymmetrizer in Kucharski-Bartlett notation
//TODO perhaps implement application of a permutation algebra to a product of several tensors
};