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SUBROUTINE lbc_nfd_/**/PRECISION( ptab, cd_nat, psgn, khls, kfld )
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TYPE(PTR_4d_/**/PRECISION), DIMENSION(:), INTENT(inout) :: ptab ! pointer of arrays on which apply the b.c.
CHARACTER(len=1), DIMENSION(:), INTENT(in ) :: cd_nat ! nature of array grid-points
REAL(PRECISION), DIMENSION(:), INTENT(in ) :: psgn ! sign used across the north fold boundary
INTEGER , INTENT(in ) :: khls ! halo size, default = nn_hls
INTEGER , INTENT(in ) :: kfld ! number of pt3d arrays
!
INTEGER :: ji, jj, jk, jl, jf ! dummy loop indices
INTEGER :: ipi, ipj, ipk, ipl, ipf ! dimension of the input array
INTEGER :: ii1, ii2, ij1, ij2
!!----------------------------------------------------------------------
!
ipi = SIZE(ptab(1)%pt4d,1)
ipj = SIZE(ptab(1)%pt4d,2)
ipk = SIZE(ptab(1)%pt4d,3)
ipl = SIZE(ptab(1)%pt4d,4)
ipf = kfld
!
IF( ipi /= Ni0glo+2*khls ) THEN
WRITE(ctmp1,*) 'lbc_nfd input array does not match khls', ipi, khls, Ni0glo
CALL ctl_stop( 'STOP', ctmp1 )
ENDIF
!
DO jf = 1, ipf ! Loop on the number of arrays to be treated
!
IF( c_NFtype == 'T' ) THEN ! * North fold T-point pivot
!
SELECT CASE ( cd_nat(jf) )
CASE ( 'T' , 'W' ) ! T-, W-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls lines (from ipj to ipj-khls+1) : full
DO jj = 1, khls
ij1 = ipj - jj + 1 ! ends at: ipj - khls + 1
ij2 = ipj - 2*khls + jj - 1 ! ends at: ipj - 2*khls + khls - 1 = ipj - khls - 1
!
DO ji = 1, khls ! first khls points
ii1 = ji ! ends at: khls
ii2 = 2*khls + 2 - ji ! ends at: 2*khls + 2 - khls = khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point khls+1
ii1 = khls + ji
ii2 = ii1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo - 1 ! points from khls+2 to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = 2 + khls + ji - 1 ! ends at: 2 + khls + ipi - 2*khls - 1 - 1 = ipi - khls
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls - ( ipi - 2*khls - 1 ) + 1 = khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point ipi - khls + 1
ii1 = ipi - khls + ji
ii2 = khls + ji
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls-1 ! last khls-1 points
ii1 = ipi - khls + 1 + ji ! ends at: ipi - khls + 1 + khls - 1 = ipi
ii2 = ipi - khls + 1 - ji ! ends at: ipi - khls + 1 - khls + 1 = ipi - 2*khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
! line number ipj-khls : right half
DO jj = 1, 1
ij1 = ipj - khls
ij2 = ij1 ! same line
!
DO ji = 1, Ni0glo/2-1 ! points from ipi/2+2 to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = ipi/2 + ji + 1 ! ends at: ipi/2 + (ipi/2 - khls - 1) + 1 = ipi - khls
ii2 = ipi/2 - ji + 1 ! ends at: ipi/2 - (ipi/2 - khls - 1) + 1 = khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! first khls points: redo them just in case (if e-w periodocity already done)
! ! as we just changed points ipi-2khls+1 to ipi-khls
ii1 = ji ! ends at: khls
ii2 = 2*khls + 2 - ji ! ends at: 2*khls + 2 - khls = khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
! ! last khls-1 points: have been / will done by e-w periodicity
END DO
!
END DO; END DO
CASE ( 'U' ) ! U-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls lines (from ipj to ipj-khls+1) : full
DO jj = 1, khls
ij1 = ipj - jj + 1 ! ends at: ipj - khls + 1
ij2 = ipj - 2*khls + jj - 1 ! ends at: ipj - 2*khls + khls - 1 = ipj - khls - 1
!
DO ji = 1, khls ! first khls points
ii1 = ji ! ends at: khls
ii2 = 2*khls + 1 - ji ! ends at: 2*khls + 1 - khls = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo ! points from khls to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = khls + ji ! ends at: khls + ipi - 2*khls = ipi - khls
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls - ( ipi - 2*khls ) + 1 = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! last khls points
ii1 = ipi - khls + ji ! ends at: ipi - khls + khls = ipi
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls + 1 - khls = ipi - 2*khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
! line number ipj-khls : right half
DO jj = 1, 1
ij1 = ipj - khls
ij2 = ij1 ! same line
!
DO ji = 1, Ni0glo/2 ! points from ipi/2+1 to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = ipi/2 + ji ! ends at: ipi/2 + (ipi/2 - khls) = ipi - khls
ii2 = ipi/2 - ji + 1 ! ends at: ipi/2 - (ipi/2 - khls) + 1 = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! first khls points: redo them just in case (if e-w periodocity already done)
! ! as we just changed points ipi-2khls+1 to ipi-khls
ii1 = ji ! ends at: khls
ii2 = 2*khls + 1 - ji ! ends at: 2*khls + 1 - khls = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
! ! last khls-1 points: have been / will done by e-w periodicity
END DO
!
END DO; END DO
CASE ( 'V' ) ! V-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls+1 lines (from ipj to ipj-khls) : full
DO jj = 1, khls+1
ij1 = ipj - jj + 1 ! ends at: ipj - ( khls + 1 ) + 1 = ipj - khls
ij2 = ipj - 2*khls + jj - 2 ! ends at: ipj - 2*khls + khls + 1 - 2 = ipj - khls - 1
!
DO ji = 1, khls ! first khls points
ii1 = ji ! ends at: khls
ii2 = 2*khls + 2 - ji ! ends at: 2*khls + 2 - khls = khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point khls+1
ii1 = khls + ji
ii2 = ii1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo - 1 ! points from khls+2 to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = 2 + khls + ji - 1 ! ends at: 2 + khls + ipi - 2*khls - 1 - 1 = ipi - khls
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls - ( ipi - 2*khls - 1 ) + 1 = khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point ipi - khls + 1
ii1 = ipi - khls + ji
ii2 = khls + ji
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls-1 ! last khls-1 points
ii1 = ipi - khls + 1 + ji ! ends at: ipi - khls + 1 + khls - 1 = ipi
ii2 = ipi - khls + 1 - ji ! ends at: ipi - khls + 1 - khls + 1 = ipi - 2*khls + 2
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
END DO; END DO
CASE ( 'F' ) ! F-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls+1 lines (from ipj to ipj-khls) : full
DO jj = 1, khls+1
ij1 = ipj - jj + 1 ! ends at: ipj - ( khls + 1 ) + 1 = ipj - khls
ij2 = ipj - 2*khls + jj - 2 ! ends at: ipj - 2*khls + khls + 1 - 2 = ipj - khls - 1
!
DO ji = 1, khls ! first khls points
ii1 = ji ! ends at: khls
ii2 = 2*khls + 1 - ji ! ends at: 2*khls + 1 - khls = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo ! points from khls to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = khls + ji ! ends at: khls + ipi - 2*khls = ipi - khls
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls - ( ipi - 2*khls ) + 1 = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! last khls points
ii1 = ipi - khls + ji ! ends at: ipi - khls + khls = ipi
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls + 1 - khls = ipi - 2*khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
END DO; END DO
END SELECT ! cd_nat(jf)
!
ENDIF ! c_NFtype == 'T'
!
IF( c_NFtype == 'F' ) THEN ! * North fold F-point pivot
!
SELECT CASE ( cd_nat(jf) )
CASE ( 'T' , 'W' ) ! T-, W-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! first: line number ipj-khls : 3 points
DO jj = 1, 1
ij1 = ipj - khls
ij2 = ij1 ! same line
!
DO ji = 1, 1 ! points from ipi/2+1
ii1 = ipi/2 + ji
ii2 = ipi/2 - ji + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = ptab(jf)%pt4d(ii2,ij2,jk,jl) ! Warning: pb with sign...
END DO
DO ji = 1, 1 ! points ipi - khls
ii1 = ipi - khls + ji - 1
ii2 = khls + ji
ptab(jf)%pt4d(ii1,ij1,jk,jl) = ptab(jf)%pt4d(ii2,ij2,jk,jl) ! Warning: pb with sign...
END DO
DO ji = 1, 1 ! point khls: redo it just in case (if e-w periodocity already done)
! ! as we just changed point ipi - khls
ii1 = khls + ji - 1
ii2 = khls + ji
ptab(jf)%pt4d(ii1,ij1,jk,jl) = ptab(jf)%pt4d(ii2,ij2,jk,jl) ! Warning: pb with sign...
END DO
END DO
!
! Second: last khls lines (from ipj to ipj-khls+1) : full
DO jj = 1, khls
ij1 = ipj + 1 - jj ! ends at: ipj + 1 - khls
ij2 = ipj - 2*khls + jj ! ends at: ipj - 2*khls + khls = ipj - khls
!
DO ji = 1, khls ! first khls points
ii1 = ji ! ends at: khls
ii2 = 2*khls + 1 - ji ! ends at: 2*khls + 1 - khls = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo ! points from khls to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = khls + ji ! ends at: khls + ipi - 2*khls = ipi - khls
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls - ( ipi - 2*khls ) + 1 = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! last khls points
ii1 = ipi - khls + ji ! ends at: ipi - khls + khls = ipi
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls + 1 - khls = ipi - 2*khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
END DO; END DO
CASE ( 'U' ) ! U-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls lines (from ipj to ipj-khls+1) : full
DO jj = 1, khls
ij1 = ipj + 1 - jj ! ends at: ipj + 1 - khls
ij2 = ipj - 2*khls + jj ! ends at: ipj - 2*khls + khls = ipj - khls
!
DO ji = 1, khls-1 ! first khls-1 points
ii1 = ji ! ends at: khls-1
ii2 = 2*khls - ji ! ends at: 2*khls - ( khls - 1 ) = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point khls
ii1 = khls + ji - 1
ii2 = ipi - ii1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo - 1 ! points from khls+1 to ipi - khls - 1 (note: Ni0glo = ipi - 2*khls)
ii1 = khls + ji ! ends at: khls + ( ipi - 2*khls - 1 ) = ipi - khls - 1
ii2 = ipi - khls - ji ! ends at: ipi - khls - ( ipi - 2*khls - 1 ) = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point ipi - khls
ii1 = ipi - khls + ji - 1
ii2 = ii1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! last khls points
ii1 = ipi - khls + ji ! ends at: ipi - khls + khls = ipi
ii2 = ipi - khls - ji ! ends at: ipi - khls - khls = ipi - 2*khls
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
END DO; END DO
CASE ( 'V' ) ! V-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls lines (from ipj to ipj-khls+1) : full
DO jj = 1, khls
ij1 = ipj - jj + 1 ! ends at: ipj - khls + 1
ij2 = ipj - 2*khls + jj - 1 ! ends at: ipj - 2*khls + khls - 1 = ipj - khls - 1
!
DO ji = 1, khls ! first khls points
ii1 = ji ! ends at: khls
ii2 = 2*khls + 1 - ji ! ends at: 2*khls + 1 - khls = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo ! points from khls to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = khls + ji ! ends at: khls + ipi - 2*khls = ipi - khls
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls - ( ipi - 2*khls ) + 1 = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! last khls points
ii1 = ipi - khls + ji ! ends at: ipi - khls + khls = ipi
ii2 = ipi - khls - ji + 1 ! ends at: ipi - khls + 1 - khls = ipi - 2*khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
! line number ipj-khls : right half
DO jj = 1, 1
ij1 = ipj - khls
ij2 = ij1 ! same line
!
DO ji = 1, Ni0glo/2 ! points from ipi/2+1 to ipi - khls (note: Ni0glo = ipi - 2*khls)
ii1 = ipi/2 + ji ! ends at: ipi/2 + (ipi/2 - khls) = ipi - khls
ii2 = ipi/2 - ji + 1 ! ends at: ipi/2 - (ipi/2 - khls) + 1 = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! first khls points: redo them just in case (if e-w periodocity already done)
! ! as we just changed points ipi-2khls+1 to ipi-khls
ii1 = ji ! ends at: khls
ii2 = 2*khls + 1 - ji ! ends at: 2*khls + 1 - khls = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
! ! last khls points: have been / will done by e-w periodicity
END DO
!
END DO; END DO
CASE ( 'F' ) ! F-point
DO jl = 1, ipl ; DO jk = 1, ipk
!
! last khls lines (from ipj to ipj-khls+1) : full
DO jj = 1, khls
ij1 = ipj - jj + 1 ! ends at: ipj - khls + 1
ij2 = ipj - 2*khls + jj - 1 ! ends at: ipj - 2*khls + khls - 1 = ipj - khls - 1
!
DO ji = 1, khls-1 ! first khls-1 points
ii1 = ji ! ends at: khls-1
ii2 = 2*khls - ji ! ends at: 2*khls - ( khls - 1 ) = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point khls
ii1 = khls + ji - 1
ii2 = ipi - ii1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, Ni0glo - 1 ! points from khls+1 to ipi - khls - 1 (note: Ni0glo = ipi - 2*khls)
ii1 = khls + ji ! ends at: khls + ( ipi - 2*khls - 1 ) = ipi - khls - 1
ii2 = ipi - khls - ji ! ends at: ipi - khls - ( ipi - 2*khls - 1 ) = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, 1 ! point ipi - khls
ii1 = ipi - khls + ji - 1
ii2 = ii1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls ! last khls points
ii1 = ipi - khls + ji ! ends at: ipi - khls + khls = ipi
ii2 = ipi - khls - ji ! ends at: ipi - khls - khls = ipi - 2*khls
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
END DO
!
! line number ipj-khls : right half
DO jj = 1, 1
ij1 = ipj - khls
ij2 = ij1 ! same line
!
DO ji = 1, Ni0glo/2-1 ! points from ipi/2+1 to ipi - khls-1 (note: Ni0glo = ipi - 2*khls)
ii1 = ipi/2 + ji ! ends at: ipi/2 + (ipi/2 - khls) = ipi - khls
ii2 = ipi/2 - ji ! ends at: ipi/2 - (ipi/2 - khls - 1 ) = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
DO ji = 1, khls-1 ! first khls-1 points: redo them just in case (if e-w periodocity already done)
! ! as we just changed points ipi-2khls+1 to ipi-nn_hl-1
ii1 = ji ! ends at: khls
ii2 = 2*khls - ji ! ends at: 2*khls - ( khls - 1 ) = khls + 1
ptab(jf)%pt4d(ii1,ij1,jk,jl) = psgn(jf) * ptab(jf)%pt4d(ii2,ij2,jk,jl)
END DO
! ! last khls points: have been / will done by e-w periodicity
END DO
!
END DO; END DO
END SELECT ! cd_nat(jf)
!
ENDIF ! c_NFtype == 'F'
!
END DO ! ipf
!
END SUBROUTINE lbc_nfd_/**/PRECISION