mirror of
https://github.com/LCPQ/quantum_package
synced 2024-06-26 23:22:18 +02:00
65 lines
1.7 KiB
FortranFixed
65 lines
1.7 KiB
FortranFixed
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BEGIN_PROVIDER [ character*(64), diag_algorithm ]
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implicit none
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BEGIN_DOC
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! Diagonalization algorithm (Davidson or Lapack)
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END_DOC
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if (N_det > 500) then
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diag_algorithm = "Davidson"
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else
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diag_algorithm = "Lapack"
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endif
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END_PROVIDER
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BEGIN_PROVIDER [ double precision, CI_energy, (N_states) ]
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implicit none
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BEGIN_DOC
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! N_states lowest eigenvalues of the CI matrix
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END_DOC
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integer :: j
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do j=1,min(N_states,N_det)
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CI_energy(j) = CI_electronic_energy(j) + nuclear_repulsion
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enddo
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END_PROVIDER
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BEGIN_PROVIDER [ double precision, CI_electronic_energy, (N_states) ]
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&BEGIN_PROVIDER [ double precision, CI_eigenvectors, (N_det,N_states) ]
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implicit none
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BEGIN_DOC
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! Eigenvectors/values of the CI matrix
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END_DOC
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integer :: i,j
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do j=1,N_states
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do i=1,N_det
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CI_eigenvectors(i,j) = psi_coef(i,j)
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enddo
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enddo
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if (diag_algorithm == "Davidson") then
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call davidson_diag(psi_det,CI_eigenvectors,CI_electronic_energy, &
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size(CI_eigenvectors,1),N_det,N_states,N_int,output_Dets)
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else if (diag_algorithm == "Lapack") then
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double precision, allocatable :: eigenvectors(:,:), eigenvalues(:)
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allocate (eigenvectors(size(H_matrix_all_dets,1),N_det))
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allocate (eigenvalues(N_det))
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call lapack_diag(eigenvalues,eigenvectors, &
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H_matrix_all_dets,size(H_matrix_all_dets,1),N_det)
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CI_electronic_energy(:) = 0.d0
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do j=1,min(N_states,N_det)
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do i=1,N_det
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CI_eigenvectors(i,j) = eigenvectors(i,j)
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enddo
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CI_electronic_energy(j) = eigenvalues(j)
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enddo
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deallocate(eigenvectors,eigenvalues)
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endif
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END_PROVIDER
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