expLanczos()

template<typename Vector , typename Matrix , typename Scalar >

IterativeExit syten::Krylov::expLanczos ( Vector &&  vec, Matrix const &  mat, IterativeConfig const &  conf, Scalar  prefactor, Vector &  result  )

inline

expLanczos shorthand for an exponential Lanczos solver, calculates \(\exp(c H) v\)

Parameters

[in]	vec	the initial vector, \( v \) above
[in]	mat	the matrix to solve, \( H \) above
[in]	conf	the parameters for the iteration
[in]	prefactor	scalar prefactor in the exponential, \( c \) above
[out]	result	resulting vector, \(\exp(c H) v\) above

Returns

info on the execution of the Lanczos routine (number of iterations, exit code)

Referenced by syten::MPS::TDVP::LBOWorker::evo_bond_m(), syten::MPS::TDVP::LBOWorker::evo_bond_v(), syten::MPS::TDVP::LBOWorker::evo_one_m(), syten::MPS::TDVP::LBOWorker::evo_one_v(), syten::MPS::TDVP::LBOWorker::evo_two_m(), syten::MPS::TDVP::LBOWorker::evo_two_v(), syten::T3N::TDVP::Worker::evolve_bond(), syten::T3N::TDVP::Worker::evolve_branching_1site(), syten::T3N::TDVP::Worker::evolve_phys_1site(), syten::T3N::TDVP::Worker::evolve_phys_2site(), syten::T3N::TDVP::Worker::evolve_phys_branch(), syten::T3N::TDVP::Worker::evolve_phys_branch_phys(), syten::MPS::TDVP::Worker::evolveBond(), syten::MPS::TDVP::Worker::evolveSite(), and syten::MPS::TDVP::Worker::evolveTwo().

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