2019-09-14 14:15:25 +02:00
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subroutine form_tau(t1,t2,tau)
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2019-09-09 16:51:15 +02:00
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! Form tau in CCSD
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implicit none
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! Input variables
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2019-09-14 14:15:25 +02:00
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double precision,intent(in) :: t1(spin_occ_num,spin_vir_num)
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double precision,intent(in) :: t2(spin_occ_num,spin_occ_num,spin_vir_num,spin_vir_num)
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2019-09-09 16:51:15 +02:00
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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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2019-09-14 14:15:25 +02:00
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double precision,intent(out) :: tau(spin_occ_num,spin_occ_num,spin_vir_num,spin_vir_num)
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2019-09-09 16:51:15 +02:00
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2019-09-14 14:15:25 +02:00
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do b=1,spin_vir_num
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do a=1,spin_vir_num
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do j=1,spin_occ_num
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do i=1,spin_occ_num
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2019-09-09 16:51:15 +02:00
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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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