truncate()

SRDef syten::MPS::LBOState::truncate	(	Truncation const &	trunc = Truncation(),
		DropNorm const	dropN = DropNorm::Yes,
		IsOrthogonal const	isOrthogonal = IsOrthogonal::No
	)

Truncates the state.

If isOrthogonal is IsOrthogonal::Left (IsOrthogonal::Right), the state is first right- (left-)normalised while truncating and then left- (right-)normalised while truncating. If isOrthogonal is IsOrthogonal::No, the state is first left-normalised without truncation and then first right-normalised with truncation and then left-normalised with truncation.

Parameters

trunc	truncation parameters to apply.
dropN	if DropNorm::Yes, normalises the transfer tensors to have norm one.
isOrthogonal	specifies assumption over the current normalisation of the state.

Returns

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

References dropUnmatched(), Left, leftnorm(), Right, and rightnorm().

Referenced by truncateKeepNorm().

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