2023-11-22 17:02:46 +01:00
|
|
|
subroutine AOtoMO_ERI_UHF(bra,ket,nBas,c,ERI_AO,ERI_MO)
|
2019-03-19 10:13:33 +01:00
|
|
|
|
2020-09-18 13:52:35 +02:00
|
|
|
! AO to MO transformation of two-electron integrals via the semi-direct O(N^5) algorithm
|
2023-11-22 16:20:14 +01:00
|
|
|
! bra and ket are the spin of (bra|ket) = (bra bra|ket ket) = <bra ket|bra ket>
|
2019-03-19 10:13:33 +01:00
|
|
|
|
|
|
|
implicit none
|
2020-09-18 13:52:35 +02:00
|
|
|
include 'parameters.h'
|
2019-03-19 10:13:33 +01:00
|
|
|
|
|
|
|
! Input variables
|
|
|
|
|
2023-11-22 16:20:14 +01:00
|
|
|
integer,intent(in) :: bra
|
|
|
|
integer,intent(in) :: ket
|
2019-03-19 10:13:33 +01:00
|
|
|
integer,intent(in) :: nBas
|
2023-11-22 17:02:46 +01:00
|
|
|
double precision,intent(in) :: ERI_AO(nBas,nBas,nBas,nBas)
|
|
|
|
double precision,intent(in) :: c(nBas,nBas,nspin)
|
2019-03-19 10:13:33 +01:00
|
|
|
|
|
|
|
! Local variables
|
|
|
|
|
|
|
|
double precision,allocatable :: scr(:,:,:,:)
|
2023-11-24 10:51:31 +01:00
|
|
|
integer :: mu,nu,la,si
|
|
|
|
integer :: i,j,k,l
|
2019-03-19 10:13:33 +01:00
|
|
|
|
|
|
|
! Output variables
|
|
|
|
|
2023-07-18 14:59:18 +02:00
|
|
|
double precision,intent(out) :: ERI_MO(nBas,nBas,nBas,nBas)
|
2019-03-19 10:13:33 +01:00
|
|
|
|
|
|
|
! Memory allocation
|
2020-09-18 13:52:35 +02:00
|
|
|
|
2019-03-19 10:13:33 +01:00
|
|
|
allocate(scr(nBas,nBas,nBas,nBas))
|
|
|
|
|
2020-09-18 13:52:35 +02:00
|
|
|
! Four-index transform via semi-direct O(N^5) algorithm
|
|
|
|
|
2023-11-24 10:51:31 +01:00
|
|
|
call dgemm('T','N',nBas**3,nBas,nBas,1d0,ERI_AO,nBas,c(1,1,bra),size(c,1),0d0,scr,nBas**3)
|
2023-03-14 14:09:07 +01:00
|
|
|
|
2023-11-24 10:51:31 +01:00
|
|
|
call dgemm('T','N',nBas**3,nBas,nBas,1d0,scr,nBas,c(1,1,ket),size(c,1),0d0,ERI_MO,nBas**3)
|
2023-03-14 14:09:07 +01:00
|
|
|
|
2023-11-24 10:51:31 +01:00
|
|
|
call dgemm('T','N',nBas**3,nBas,nBas,1d0,ERI_MO,nBas,c(1,1,bra),size(c,1),0d0,scr,nBas**3)
|
2023-03-14 14:09:07 +01:00
|
|
|
|
2023-11-24 10:51:31 +01:00
|
|
|
call dgemm('T','N',nBas**3,nBas,nBas,1d0,scr,nBas,c(1,1,ket),size(c,1),0d0,ERI_MO,nBas**3)
|
2020-06-09 21:24:37 +02:00
|
|
|
|
2023-07-18 14:59:18 +02:00
|
|
|
end subroutine
|