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guez |
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module principal_cshift_m |
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implicit none |
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contains |
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subroutine principal_cshift(is2, xlon, xprimm) |
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guez |
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! Add or subtract 2 pi so that xlon is near [-pi, pi], then cshift |
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! so that xlon is in ascending order. Make the same cshift on |
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! xprimm. |
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guez |
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USE dimensions, ONLY: iim |
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guez |
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use dynetat0_m, only: clon |
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guez |
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use nr_util, only: twopi |
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integer, intent(in):: is2 |
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real, intent(inout):: xlon(:), xprimm(:) ! (iim + 1) |
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!----------------------------------------------------- |
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if (is2 /= 0) then |
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IF (clon <= 0.) THEN |
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IF (is2 /= 1) THEN |
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xlon(:is2 - 1) = xlon(:is2 - 1) + twopi |
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xlon(:iim) = cshift(xlon(:iim), shift = is2 - 1) |
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xprimm(:iim) = cshift(xprimm(:iim), shift = is2 - 1) |
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END IF |
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else |
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xlon(is2 + 1:iim) = xlon(is2 + 1:iim) - twopi |
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xlon(:iim) = cshift(xlon(:iim), shift = is2) |
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xprimm(:iim) = cshift(xprimm(:iim), shift = is2) |
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end IF |
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end if |
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xlon(iim + 1) = xlon(1) + twopi |
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xprimm(iim + 1) = xprimm(1) |
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end subroutine principal_cshift |
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end module principal_cshift_m |
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