directional_qr()

std::tuple< STensor, STensor, SBasis > syten::IPEPSv2::directional_qr	(	STensor const &	in,
		SBasisId const &	aux,
		SBasisId const &	phy
	)

Decomposes the state tensor in in the direction of the basis aux, moving the physical basis phy into a rank-3 tensor.

Returns a new rank-4 tensor q, a rank-3 tensor r (with bases aux, phy and intermediate) and the intermediate basis created by the QR decomposition.

References syten::STensorImpl::STensor::b(), syten::STensorImpl::demerge(), syten::STensorImpl::SBasis::dir(), syten::STensorImpl::flip_on_tensor(), syten::IdentityDenseTensorImpl::merge(), syten::STensorImpl::SBasis::name(), syten::STensorImpl::qr(), and SYTEN_ASSERT.

Referenced by full_update_horizontal(), full_update_vertical(), and simple_update().

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