/[lmdze]/trunk/Sources/dyn3d/invert_zoom_x.f
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revision 139 by guez, Tue May 26 17:46:03 2015 UTC revision 146 by guez, Tue Jun 16 17:27:33 2015 UTC
# Line 6  module invert_zoom_x_m Line 6  module invert_zoom_x_m
6    
7  contains  contains
8    
9    subroutine invert_zoom_x(xf, xtild, Xprimt, xlon, xprimm, xuv)    subroutine invert_zoom_x(xf, xtild, G, xlon, xprimm, xuv)
10    
11      use coefpoly_m, only: coefpoly      use coefpoly_m, only: coefpoly
12      USE dimens_m, ONLY: iim      USE dimens_m, ONLY: iim
13      use dynetat0_m, only: clon      use dynetat0_m, only: clon
14      use nr_util, only: pi_d, twopi_d      use nr_util, only: pi_d, twopi_d
15        use numer_rec_95, only: hunt
16    
17        DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), G(0:) ! (0:nmax)
18    
     DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), Xprimt(0:) ! (0:2 * nmax)  
19      real, intent(out):: xlon(:), xprimm(:) ! (iim)      real, intent(out):: xlon(:), xprimm(:) ! (iim)
20    
21      DOUBLE PRECISION, intent(in):: xuv      DOUBLE PRECISION, intent(in):: xuv
22        ! between - 0.25 and 0.5
23      ! 0. si calcul aux points scalaires      ! 0. si calcul aux points scalaires
24      ! 0.5 si calcul aux points U      ! 0.5 si calcul aux points U
25    
26      ! Local:      ! Local:
27      DOUBLE PRECISION xo1, Xfi, a0, a1, a2, a3, Xf1, Xprimin      DOUBLE PRECISION xo1, Xfi, abs_xfi, a0, a1, a2, a3, Xf1, Xprimin
28      integer i, it, iter      integer i, it, iter
29      DOUBLE PRECISION, parameter:: my_eps = 1d-6      DOUBLE PRECISION, parameter:: my_eps = 1d-6
30    
# Line 30  contains Line 33  contains
33    
34      !------------------------------------------------------------------      !------------------------------------------------------------------
35    
36        it = 0 ! initial guess
37    
38      DO i = 1, iim      DO i = 1, iim
39         Xfi = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim         Xfi = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim
40           ! - pi <= xfi < pi
41           abs_xfi = abs(xfi)
42    
43         it = 2 * nmax         call hunt(xf, abs_xfi, it, my_lbound = 0)
44         do while (xfi < xf(it) .and. it >= 1)         ! {0 <= it <= nmax - 1}
           it = it - 1  
        end do  
45    
46         ! Calcul de Xf(xvrai(i))         ! Calcul de xvrai(i) et xxprim(i)
47    
48           CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &
49                xtild(it + 1), a0, a1, a2, a3)
50         xvrai(i) = xtild(it)         xvrai(i) = xtild(it)
   
        IF (it == 2 * nmax) THEN  
           it = 2 * nmax -1  
        END IF  
   
        CALL coefpoly(Xf(it), Xf(it + 1), Xprimt(it), Xprimt(it + 1), &  
             xtild(it), xtild(it + 1), a0, a1, a2, a3)  
51         Xf1 = Xf(it)         Xf1 = Xf(it)
52         Xprimin = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)         Xprimin = G(it)
53         xo1 = xvrai(i)         xo1 = xvrai(i)
54         iter = 1         iter = 1
55    
56         do         do
57            xvrai(i) = xvrai(i) - (Xf1 - Xfi) / Xprimin            xvrai(i) = xvrai(i) - (Xf1 - abs_xfi) / Xprimin
58            IF (ABS(xvrai(i) - xo1) <= my_eps .or. iter == 300) exit            IF (ABS(xvrai(i) - xo1) <= my_eps .or. iter == 300) exit
59            xo1 = xvrai(i)            xo1 = xvrai(i)
60            Xf1 = a0 + xvrai(i) * (a1 + xvrai(i) * (a2 + xvrai(i) * a3))            Xf1 = a0 + xvrai(i) * (a1 + xvrai(i) * (a2 + xvrai(i) * a3))
# Line 64  contains Line 64  contains
64         if (ABS(xvrai(i) - xo1) > my_eps) then         if (ABS(xvrai(i) - xo1) > my_eps) then
65            ! iter == 300            ! iter == 300
66            print *, 'Pas de solution.'            print *, 'Pas de solution.'
67            print *, i, xfi            print *, i, abs_xfi
68            STOP 1            STOP 1
69         end if         end if
70    
71           if (xfi < 0) xvrai(i) = - xvrai(i)
72         xxprim(i) = twopi_d / (iim * Xprimin)         xxprim(i) = twopi_d / (iim * Xprimin)
73      end DO      end DO
74    
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