merge()

template<Rank irank>

Tensor<irank-1> syten::MPS::TEBD::merge ( Tensor< irank > const &  itensor, MergeConfig &  bases, int const  merge_at = irank-1, bool const  switch_bases = false  )

inline

Takes a Tensor with rang irank and merges the legs with indices merge_at and merge_at+1 into a leg with index merge_at.

All indices greater than merge_at-1 will be shifted by -1.

Parameters

[in]	itensor	Tensor of rank irank
[out]	bases	merge configuration
[in]	merge_at	first index to be merged
[in]	switch_bases	whether to switch order of bases

Returns

merged tensor

References syten::Basis::dir, syten::MPS::TEBD::MergeConfig::first(), syten::Basis::flipped(), syten::genFuse(), syten::genSplit(), syten::Tensor< rank >::getBasis(), syten::Inc, syten::MPS::TEBD::MergeConfig::second(), syten::MPS::TEBD::MergeConfig::switch_bases, and SYTEN_ASSERT_DEBUG.

Referenced by build_local_T().

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