leftnorm() [1/2]

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

Normalises the tensors on the specified site to be left-normalised, i.e. occuring to the left of the central site.

If trunc is not truncating, does a QR of the LBO matrix followed by a QR decomposition of the MPS tensor. Otherwise, first normalises the LBO matrix towards the MPS tensor, truncates the MPS tensor towards the LBO matrix, truncates the LBO matrix towards the MPS tensor and then truncates the MPS tensor towards the right.

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 tensors to have norm one.
dropU	if DropUnmatched::Yes, remove unmatched blocks during the various truncations.

Returns

an upper bound on the error incurred during the truncation, the actual error is most likely lower.

References leftnormM(), physnormM(), and physnormV().

Referenced by syten::MPS::DMRG::LBOWorker::LBOWorker(), leftnorm(), and truncate().

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