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quack/src/AOtoMO/AOtoMO_oovv.f90

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2019-03-19 10:13:33 +01:00
subroutine AOtoMO_oovv(nBas,nO,nV,cO,cV,O,ooOvv)
! AO to MO transformation of two-electron integrals for the block oovv
! Semi-direct O(N^5) algorithm
implicit none
! Input variables
integer,intent(in) :: nBas,nO,nV
double precision,intent(in) :: cO(nBas,nO),cV(nBas,nV),O(nBas,nBas,nBas,nBas)
! Local variables
double precision,allocatable :: scr1(:,:,:,:),scr2(:,:,:,:)
integer :: mu,nu,la,si,i,j,a,b
! Output variables
double precision,intent(out) :: ooOvv(nO,nO,nV,nV)
! Memory allocation
allocate(scr1(nBas,nBas,nBas,nBas),scr2(nBas,nBas,nBas,nBas))
scr1 = 0d0
do mu=1,nBas
do nu=1,nBas
do la=1,nBas
do si=1,nBas
do b=1,nV
scr1(mu,nu,la,b) = scr1(mu,nu,la,b) + O(mu,nu,la,si)*cV(si,b)
enddo
enddo
enddo
enddo
enddo
scr2 = 0d0
do mu=1,nBas
do nu=1,nBas
do la=1,nBas
do i=1,nO
do b=1,nV
scr2(i,nu,la,b) = scr2(i,nu,la,b) + cO(mu,i)*scr1(mu,nu,la,b)
enddo
enddo
enddo
enddo
enddo
scr1 = 0d0
do nu=1,nBas
do la=1,nBas
do i=1,nO
do a=1,nV
do b=1,nV
scr1(i,nu,a,b) = scr1(i,nu,a,b) + scr2(i,nu,la,b)*cV(la,a)
enddo
enddo
enddo
enddo
enddo
ooOvv = 0d0
do nu=1,nBas
do i=1,nO
do j=1,nO
do a=1,nV
do b=1,nV
ooOvv(i,j,a,b) = ooOvv(i,j,a,b) + cO(nu,j)*scr1(i,nu,a,b)
enddo
enddo
enddo
enddo
enddo
end subroutine AOtoMO_oovv