directional_qrs.h File Reference

Definition of "directional" QR decompositions on iPEPSv2 state tensors to move the physical index onto a leg. More...

#include "inc/ipeps2/state.h"

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Namespaces
namespace	syten
	Syten namespace.
namespace	syten::IPEPSv2
	Namespace for the second-generation iPEPS code (iPEPSv2).

Functions
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. More...
std::tuple< STensor, STensor, SBasis >	syten::IPEPSv2::directional_svd (STensor const &in, SBasisId const &aux, SBasisId const &phy)
	Like directional_qr, decomposes the state tensor into a rank-3 tensor with auxiliary basis aux and the physical basis phy, but does so using a truncating SVD. More...
STensor	syten::IPEPSv2::inv_directional_qr (STensor const &r4, STensor const &r3)
	Inverts the directional_qr operation by multiplying the rank-4 and rank-3 tensors. More...

Detailed Description

Definition of "directional" QR decompositions on iPEPSv2 state tensors to move the physical index onto a leg.