From bbe9024304f67653b81bac0cfa5ff13431c26566 Mon Sep 17 00:00:00 2001 From: Anthony Scemama Date: Thu, 29 Dec 2016 22:01:09 +0100 Subject: [PATCH] Forgot file --- src/Davidson/find_reference.irp.f | 41 +++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 src/Davidson/find_reference.irp.f diff --git a/src/Davidson/find_reference.irp.f b/src/Davidson/find_reference.irp.f new file mode 100644 index 00000000..0cafd739 --- /dev/null +++ b/src/Davidson/find_reference.irp.f @@ -0,0 +1,41 @@ +subroutine find_reference(thresh,n_ref,result) + implicit none + double precision, intent(in) :: thresh + integer, intent(out) :: result(N_det),n_ref + integer :: i,j,istate + double precision :: i_H_psi_array(1), E0, hii, norm + double precision :: de + integer(bit_kind), allocatable :: psi_ref_(:,:,:) + double precision, allocatable :: psi_ref_coef_(:,:) + + allocate(psi_ref_coef_(N_det,1), psi_ref_(N_int,2,N_det)) + n_ref = 1 + result(1) = 1 + istate = 1 + psi_ref_coef_(1,1) = psi_coef(1,istate) + psi_ref_(:,:,1) = psi_det(:,:,1) + norm = psi_ref_coef_(1,1) * psi_ref_coef_(1,1) + call u_0_H_u_0(E0,psi_ref_coef_,n_ref,psi_ref_,N_int,1,size(psi_ref_coef_,1)) + print *, '' + print *, 'Reference determinants' + print *, '======================' + print *, '' + print *, n_ref, ': E0 = ', E0 + nuclear_repulsion + call debug_det(psi_ref_(1,1,n_ref),N_int) + do i=2,N_det + call i_h_psi(psi_det(1,1,i),psi_ref_(1,1,1),psi_ref_coef_(1,istate),N_int, & + n_ref,size(psi_ref_coef_,1),1,i_H_psi_array) + call i_H_j(psi_det(1,1,i),psi_det(1,1,i),N_int,hii) + de = i_H_psi_array(istate)**2 / (E0 - hii) + if (dabs(de) > thresh) then + n_ref += 1 + result(n_ref) = i + psi_ref_(:,:,n_ref) = psi_det(:,:,i) + psi_ref_coef_(n_ref,1) = psi_coef(i,istate) + call u_0_H_u_0(E0,psi_ref_coef_,n_ref,psi_ref_,N_int,1,size(psi_ref_coef_,1)) + print *, n_ref, ': E0 = ', E0 + nuclear_repulsion + call debug_det(psi_ref_(1,1,n_ref),N_int) + endif + enddo +end +