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tensor: permutation of indices inside a symmetry group

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Jiri Pittner
2025-11-18 18:09:04 +01:00
parent 20a61e2fb9
commit 78569ca701
6 changed files with 159 additions and 3 deletions
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2
tensor.h
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@@ -384,6 +384,7 @@ public:
void split_index_group(int group); //formal in-place split of a non-symmetric index group WITHOUT the need for data reorganization or names rearrangement
void split_index_group1(int group); //formal in-place split of the leftmost index in a non-symmetric index group WITHOUT the need for data reorganization or names rearrangement
void merge_adjacent_index_groups(int groupfrom, int groupto); //formal merge of non-symmetric index groups WITHOUT the need for data reorganization or names rearrangement
void permute_inside_group(int group, const NRPerm<int> &p, bool inverse=false); //permute indices inside a symmetric index group only
Tensor merge_index_groups(const NRVec<int> &groups) const;
Tensor flatten(int group= -1) const; //split and uncompress a given group or all of them, leaving flat index order the same
@@ -653,7 +654,6 @@ NRMat<T> mat(t.data,range*(range-1)/2,range*(range-1)/2);
f=fourindex_dense<antisymtwoelectronrealdirac,T,I>(range,NRSMat<T>(mat)); //symmetrize mat
}
//@@@formal permutation of names inside a sym/antisy group (with possible sign change)
template <typename T>