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mirror of https://github.com/QuantumPackage/qp2.git synced 2024-07-19 09:13:26 +02:00
qp2/src/davidson_dressed/nonsym_diagonalize_ci.irp.f
2023-03-15 10:23:48 +01:00

189 lines
4.5 KiB
Fortran

! ---
BEGIN_PROVIDER [ double precision, CI_energy_nonsym_dressed, (N_states_diag) ]
BEGIN_DOC
! N_states lowest eigenvalues of the CI matrix
END_DOC
implicit none
integer :: j
character*(8) :: st
call write_time(6)
do j = 1, min(N_det, N_states_diag)
CI_energy_nonsym_dressed(j) = CI_electronic_energy_nonsym_dressed(j) + nuclear_repulsion
enddo
do j = 1, min(N_det, N_states)
write(st, '(I4)') j
call write_double(6, CI_energy_nonsym_dressed(j), 'Energy of state '//trim(st))
enddo
END_PROVIDER
! ---
BEGIN_PROVIDER [ double precision, CI_electronic_energy_nonsym_dressed, (N_states_diag) ]
&BEGIN_PROVIDER [ double precision, CI_eigenvectors_nonsym_dressed, (N_det,N_states_diag) ]
BEGIN_DOC
! Eigenvectors/values of the CI matrix
END_DOC
implicit none
logical :: converged
integer :: i, j, k
integer :: i_other_state
integer :: i_state
logical, allocatable :: good_state_array(:)
integer, allocatable :: index_good_state_array(:)
double precision, allocatable :: eigenvectors(:,:), eigenvalues(:)
PROVIDE threshold_nonsym_davidson nthreads_davidson
! Guess values for the "N_states" states of the CI_eigenvectors_nonsym_dressed
do j = 1, min(N_states, N_det)
do i = 1, N_det
CI_eigenvectors_nonsym_dressed(i,j) = psi_coef(i,j)
enddo
enddo
do j = min(N_states, N_det)+1, N_states_diag
do i = 1, N_det
CI_eigenvectors_nonsym_dressed(i,j) = 0.d0
enddo
enddo
! ---
if(diag_algorithm == "Davidson") then
ASSERT(n_states_diag .lt. n_states)
do j = 1, min(N_states, N_det)
do i = 1, N_det
CI_eigenvectors_nonsym_dressed(i,j) = psi_coef(i,j)
enddo
enddo
converged = .False.
call davidson_diag_nonsym_h( psi_det, CI_eigenvectors_nonsym_dressed &
, size(CI_eigenvectors_nonsym_dressed, 1) &
, CI_electronic_energy_nonsym_dressed &
, N_det, min(N_det, N_states), min(N_det, N_states_diag), N_int, 1, converged )
else if(diag_algorithm == "Lapack") then
allocate(eigenvectors(size(H_matrix_nonsym_dressed, 1),N_det))
allocate(eigenvalues(N_det))
call diag_nonsym_right( N_det, H_matrix_nonsym_dressed, size(H_matrix_nonsym_dressed, 1) &
, eigenvectors, size(eigenvectors, 1), eigenvalues, size(eigenvalues, 1) )
CI_electronic_energy_nonsym_dressed(:) = 0.d0
! Select the "N_states_diag" states of lowest energy
do j = 1, min(N_det, N_states_diag)
do i = 1, N_det
CI_eigenvectors_nonsym_dressed(i,j) = eigenvectors(i,j)
enddo
CI_electronic_energy_nonsym_dressed(j) = eigenvalues(j)
enddo
deallocate(eigenvectors, eigenvalues)
! --- ---
endif
! ---
END_PROVIDER
! ---
subroutine diagonalize_CI_nonsym_dressed()
BEGIN_DOC
! Replace the coefficients of the CI states by the coefficients of the
! eigenstates of the CI matrix
END_DOC
implicit none
integer :: i, j
PROVIDE dressing_delta
do j = 1, N_states
do i = 1, N_det
psi_coef(i,j) = CI_eigenvectors_nonsym_dressed(i,j)
enddo
enddo
SOFT_TOUCH psi_coef
end subroutine diagonalize_CI_nonsym_dressed
! ---
BEGIN_PROVIDER [ double precision, H_matrix_nonsym_dressed, (N_det,N_det) ]
BEGIN_DOC
! Dressed H with Delta_ij
END_DOC
implicit none
integer :: i, j, l, k
double precision :: f
H_matrix_nonsym_dressed(1:N_det,1:N_det) = h_matrix_all_dets(1:N_det,1:N_det)
if(N_states == 1) then
! !symmetric formula
! l = dressed_column_idx(1)
! f = 1.0d0/psi_coef(l,1)
! do i=1,N_det
! h_matrix_nonsym_dressed(i,l) += dressing_column_h(i,1) *f
! h_matrix_nonsym_dressed(l,i) += dressing_column_h(i,1) *f
! enddo
! l = dressed_column_idx(1)
! f = 1.0d0 / psi_coef(l,1)
! do j = 1, N_det
! H_matrix_nonsym_dressed(j,l) += f * dressing_delta(j,1)
! enddo
k = 1
l = 1
f = overlap_states_inv(k,l)
do j = 1, N_det
do i = 1, N_det
H_matrix_nonsym_dressed(i,j) = H_matrix_nonsym_dressed(i,j) + f * dressing_delta(i,k) * psi_coef(j,l)
enddo
enddo
else
do k = 1, N_states
do l = 1, N_states
f = overlap_states_inv(k,l)
do j = 1, N_det
do i = 1, N_det
H_matrix_nonsym_dressed(i,j) = H_matrix_nonsym_dressed(i,j) + f * dressing_delta(i,k) * psi_coef(j,l)
enddo
enddo
enddo
enddo
endif
END_PROVIDER
! ---