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module invert_zoom_x_m |
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implicit none |
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INTEGER, PARAMETER:: nmax = 30000 |
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contains |
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subroutine invert_zoom_x(xf, xtild, Xprimt, xlon, xprimm, xuv) |
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use coefpoly_m, only: coefpoly |
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use nrtype, only: pi, pi_d, twopi_d, k8 |
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use serre_mod, only: clon |
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include "dimensions.h" |
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! for iim |
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REAL(K8), intent(in):: Xf(0:), xtild(0:), Xprimt(0:) ! (0:2 * nmax) |
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real, intent(out):: xlon(:), xprimm(:) ! (iim) |
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REAL(K8), intent(in):: xuv |
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! 0. si calcul aux points scalaires |
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! 0.5 si calcul aux points U |
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! Local: |
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REAL(K8) xo1, Xfi, a0, a1, a2, a3, Xf1, Xprimin |
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integer i, it, iter |
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REAL(K8), parameter:: my_eps = 1e-6_k8 |
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REAL(K8) xxprim(iim), xvrai(iim) |
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! intermediary variables because xlon and xprimm are simple precision |
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!------------------------------------------------------------------ |
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DO i = 1, iim |
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Xfi = - pi_d + (i + xuv - 0.75_k8) * twopi_d / iim |
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it = 2 * nmax |
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do while (xfi < xf(it) .and. it >= 1) |
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it = it - 1 |
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end do |
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! Calcul de Xf(xvrai(i)) |
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xvrai(i) = xtild(it) |
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IF (it == 2 * nmax) THEN |
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it = 2 * nmax -1 |
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END IF |
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CALL coefpoly(Xf(it), Xf(it + 1), Xprimt(it), Xprimt(it + 1), & |
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xtild(it), xtild(it + 1), a0, a1, a2, a3) |
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Xf1 = Xf(it) |
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Xprimin = a1 + xvrai(i) * (2._k8 * a2 + xvrai(i) * 3._k8 * a3) |
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xo1 = xvrai(i) |
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iter = 1 |
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do |
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xvrai(i) = xvrai(i) - (Xf1 - Xfi) / Xprimin |
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IF (ABS(xvrai(i) - xo1) <= my_eps .or. iter == 300) exit |
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xo1 = xvrai(i) |
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Xf1 = a0 + xvrai(i) * (a1 + xvrai(i) * (a2 + xvrai(i) * a3)) |
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Xprimin = a1 + xvrai(i) * (2._k8 * a2 + xvrai(i) * 3._k8 * a3) |
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end DO |
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if (ABS(xvrai(i) - xo1) > my_eps) then |
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! iter == 300 |
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print *, 'Pas de solution.' |
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print *, i, xfi |
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STOP 1 |
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end if |
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xxprim(i) = twopi_d / (iim * Xprimin) |
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end DO |
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DO i = 1, iim -1 |
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IF (xvrai(i + 1) < xvrai(i)) THEN |
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print *, 'xvrai(', i + 1, ') < xvrai(', i, ')' |
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STOP 1 |
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END IF |
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END DO |
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xlon = xvrai + clon / 180. * pi |
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xprimm = xxprim |
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end subroutine invert_zoom_x |
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end module invert_zoom_x_m |