2019-01-25 11:39:31 +01:00
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use bitmasks
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BEGIN_PROVIDER [ double precision, threshold_selectors ]
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implicit none
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BEGIN_DOC
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! Thresholds on selectors (fraction of the square of the norm)
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END_DOC
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threshold_selectors = dsqrt(threshold_generators)
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END_PROVIDER
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BEGIN_PROVIDER [ integer, N_det_selectors]
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implicit none
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BEGIN_DOC
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! For Single reference wave functions, the number of selectors is 1 : the
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! Hartree-Fock determinant
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END_DOC
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integer :: i
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double precision :: norm, norm_max
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call write_time(6)
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N_det_selectors = N_det
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norm = 1.d0
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do i=1,N_det
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norm = norm - psi_average_norm_contrib_sorted(i)
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if (norm - 1.d-10 < 1.d0 - threshold_selectors) then
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N_det_selectors = i
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exit
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endif
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enddo
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N_det_selectors = max(N_det_selectors,N_det_generators)
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call write_int(6,N_det_selectors,'Number of selectors')
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END_PROVIDER
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BEGIN_PROVIDER [ integer(bit_kind), psi_selectors, (N_int,2,psi_selectors_size) ]
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&BEGIN_PROVIDER [ double precision, psi_selectors_coef, (psi_selectors_size,N_states) ]
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implicit none
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BEGIN_DOC
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! Determinants on which we apply <i|H|psi> for perturbation.
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END_DOC
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integer :: i,k
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2019-07-02 23:30:36 +02:00
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do i=1,N_det_selectors
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do k=1,N_int
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psi_selectors(k,1,i) = psi_det_sorted(k,1,i)
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psi_selectors(k,2,i) = psi_det_sorted(k,2,i)
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2019-01-25 11:39:31 +01:00
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enddo
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2019-07-02 23:30:36 +02:00
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enddo
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do k=1,N_states
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do i=1,N_det_selectors
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psi_selectors_coef(i,k) = psi_coef_sorted(i,k)
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2019-01-25 11:39:31 +01:00
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enddo
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2019-07-02 23:30:36 +02:00
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enddo
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2019-01-25 11:39:31 +01:00
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END_PROVIDER
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