leftnormM()

SRDef syten::MPS::LBOState::leftnormM	(	Index const	site,
		Truncation	trunc = Truncation(),
		DropNorm const	dropN = DropNorm::Yes,
		DropUnmatched const	dropU = DropUnmatched::Yes
	)

Normalises the rank-3 MPS tensor on the specified site towards the right (such that it occurs to the left of the central site).

Parameters

site	the site of interest
trunc	truncation parameters to apply. If trunc.notTruncating() is true, does a QR, otherwise a SVD decomposition.
dropN	if DropNorm::Yes, normalises the transfer tensor to have norm one. If all other tensors of the system are normalised towards the MPS tensor on site site, this normalises the state.
dropU	if DropUnmatched::Yes, removed blocks in the MPS tensor which are not contained in RHS neighbouring MPS tensor prior to normalisation.

Returns

the error incurred during the truncation

References syten::Tensor< rank >::clear(), dropUnmatched(), dropUnmatchedM(), dropUnmatchedV(), lIdx, lInt, m(), maybeCache(), std::move(), syten::MPS::norm(), syten::QR::qr(), rIdx, rInt, size(), syten::SVD::svd(), uIdx, uInt, v(), and Yes.

Referenced by leftnorm(), and syten::MPS::TDVP::LBOWorker::sweep_twosite().

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