energy()

std::pair< SRDef, SRDef > syten::MPS::DMRG::Worker::energy

(

Index const

i

)

Return the energy estimate from the specific site.

The first value is the calculation only for the first MPO, the second value is the sum for all MPOs.

Parameters

i	site index

Requires the left- and right contractions to the left/right of that site to exist.

References contrLeft, contrRight, syten::MPS::Operator::dIdx, length, syten::MPS::Operator::lIdx, syten::MPS::State::lIdx, op, psi, syten::MPS::Operator::rIdx, syten::MPS::State::rIdx, syten::MPS::State::rInt, SYTEN_ASSERT_DEBUG, syten::MPS::Operator::uIdx, syten::MPS::State::uIdx, and syten::MPS::State::uInt.

Referenced by Worker().

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