H_eff()

template<typename Mat , typename Vec >

DenseTensor< 2, SDef > syten::Krylov::TensorNetworksImpl::HEffTridiagExpectation::H_eff ( Mat const &  m, std::vector< Vec > const &  v  )

inline

Calculate all new coefficients and return the new tridiagonal matrix.

Template Parameters

Mat	type of the full matrix
Vec	type of the full vector

Parameters

m	full matrix
v	set of Krylov vectors

Returns

the matrix m projected into the Krylov space spanned by v with only the tridiagonal elements calculated and all others set to zero.

References a, b, std::vector< T >::back(), std::vector< T >::empty(), syten::IPEPS::expectation(), std::vector< T >::front(), std::vector< T >::push_back(), syten::real(), and std::vector< T >::size().

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