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35 lines
603 B
Fortran
35 lines
603 B
Fortran
subroutine form_tau(nO,nV,t1,t2,tau)
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! Form tau in CCSD
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implicit none
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! Input variables
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integer,intent(in) :: nO,nV
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double precision,intent(in) :: t1(nO,nV)
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double precision,intent(in) :: t2(nO,nO,nV,nV)
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! Local variables
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integer :: i,j,k,l
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integer :: a,b,c,d
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! Output variables
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double precision,intent(out) :: tau(nO,nO,nV,nV)
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do b=1,nV
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do a=1,nV
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do j=1,nO
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do i=1,nO
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tau(i,j,a,b) = 0.5d0*t2(i,j,a,b) + t1(i,a)*t1(j,b)
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enddo
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enddo
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enddo
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enddo
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end subroutine form_tau
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