physnormV()

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

Normalises the rank-2 LBO matrix on the specified site in the direction of its associated MPS tensor.

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 LBO matrix on site site, this normalises the state.
dropU	if DropUnmatched::Yes, removed blocks in the LBO matrix which are not contained in the MPS tensor prior to normalisation.

Returns

the error incurred during the truncation

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

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

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