expectation() [1/2]

SDef syten::IPEPS::expectation	(	State const &	psi,
		ATwoOp const &	op,
		Truncation const &	trunc = Truncation()
	)

Calculates a single expectation value of the supplied two-site operator with respect to the state psi.

No CTM steps are done, so the full CTM and double layer has to be available in psi.

References syten::IPEPS::Horz2CTM::expectation_value(), and syten::IPEPS::Vert2CTM::expectation_value().

Referenced by syten::calc_expval(), syten::Krylov::TensorNetworksImpl::HEffDenseExpectation::H_eff(), syten::Krylov::TensorNetworksImpl::HEffTridiagExpectation::H_eff(), and syten::Pyten::init_ipeps_expval().

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