/[lmdze]/trunk/dyn3d/invert_zoom_x.f
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trunk/dyn3d/fxhyp_loop_ik.f revision 127 by guez, Tue Feb 10 17:58:56 2015 UTC trunk/Sources/dyn3d/invert_zoom_x.f revision 149 by guez, Thu Jun 18 12:23:44 2015 UTC
# Line 1  Line 1 
1  module fxhyp_loop_ik_m  module invert_zoom_x_m
2    
3    implicit none    implicit none
4    
5    INTEGER, PARAMETER:: nmax = 30000    INTEGER, PARAMETER:: nmax = 30000
6      DOUBLE PRECISION abs_y
7    
8      private abs_y, funcd
9    
10  contains  contains
11    
12    subroutine fxhyp_loop_ik(xf, xtild, Xprimt, xlon, xprimm, xuv)    subroutine invert_zoom_x(xf, xtild, G, xlon, xprim, xuv)
13    
14      use coefpoly_m, only: coefpoly      use coefpoly_m, only: coefpoly, a1, a2, a3
15      USE dimens_m, ONLY: iim      USE dimens_m, ONLY: iim
16        use dynetat0_m, only: clon
17      use nr_util, only: pi_d, twopi_d      use nr_util, only: pi_d, twopi_d
18      use serre, only: clon      use numer_rec_95, only: hunt, rtsafe
19    
20        DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), G(0:) ! (0:nmax)
21    
22      DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), Xprimt(0:) ! (0:2 * nmax)      real, intent(out):: xlon(:), xprim(:) ! (iim)
     real, intent(out):: xlon(:), xprimm(:) ! (iim)  
23    
24      DOUBLE PRECISION, intent(in):: xuv      DOUBLE PRECISION, intent(in):: xuv
25        ! between - 0.25 and 0.5
26      ! 0. si calcul aux points scalaires      ! 0. si calcul aux points scalaires
27      ! 0.5 si calcul aux points U      ! 0.5 si calcul aux points U
28    
29      ! Local:      ! Local:
30      DOUBLE PRECISION xo1, Xfi, a0, a1, a2, a3, Xf1, Xprimin      DOUBLE PRECISION Y
31      integer i, it, iter      integer i, it
     DOUBLE PRECISION, parameter:: my_eps = 1d-6  
32    
33      DOUBLE PRECISION xxprim(iim), xvrai(iim)      real xvrai(iim), Gvrai(iim)
34      ! intermediary variables because xlon and xprimm are simple precision      ! intermediary variables because xlon and xprim are simple precision
35    
36      !------------------------------------------------------------------      !------------------------------------------------------------------
37    
38      DO i = 1, iim      it = 0 ! initial guess
        Xfi = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim  
   
        it = 2 * nmax  
        do while (xfi < xf(it) .and. it >= 1)  
           it = it - 1  
        end do  
   
        ! Calcul de Xf(xvrai(i))  
39    
40         xvrai(i) = xtild(it)      DO i = 1, iim
41           Y = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim
42         IF (it == 2 * nmax) THEN         ! - pi <= y < pi
43            it = 2 * nmax -1         abs_y = abs(y)
44         END IF  
45           call hunt(xf, abs_y, it, my_lbound = 0)
46         CALL coefpoly(Xf(it), Xf(it + 1), Xprimt(it), Xprimt(it + 1), &         ! {0 <= it <= nmax - 1}
47              xtild(it), xtild(it + 1), a0, a1, a2, a3)  
48         Xf1 = Xf(it)         ! Calcul de xvrai(i) et Gvrai(i)
49         Xprimin = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)         CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &
50         xo1 = xvrai(i)              xtild(it + 1))
51         iter = 1         xvrai(i) = rtsafe(funcd, real(xtild(it)), real(xtild(it + 1)), &
52                xacc = 1e-6)
53         do         Gvrai(i) = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)
54            xvrai(i) = xvrai(i) - (Xf1 - Xfi) / Xprimin         if (y < 0d0) xvrai(i) = - xvrai(i)
           IF (ABS(xvrai(i) - xo1) <= my_eps .or. iter == 300) exit  
           xo1 = xvrai(i)  
           Xf1 = a0 + xvrai(i) * (a1 + xvrai(i) * (a2 + xvrai(i) * a3))  
           Xprimin = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)  
        end DO  
   
        if (ABS(xvrai(i) - xo1) > my_eps) then  
           ! iter == 300  
           print *, 'Pas de solution.'  
           print *, i, xfi  
           STOP 1  
        end if  
   
        xxprim(i) = twopi_d / (iim * Xprimin)  
55      end DO      end DO
56    
57      DO i = 1, iim -1      DO i = 1, iim -1
# Line 79  contains Line 62  contains
62      END DO      END DO
63    
64      xlon = xvrai + clon      xlon = xvrai + clon
65      xprimm = xxprim      xprim = twopi_d / (iim * Gvrai)
66    
67      end subroutine invert_zoom_x
68    
69      !**********************************************************************
70    
71      SUBROUTINE funcd(x, fval, fderiv)
72    
73        use coefpoly_m, only: a0, a1, a2, a3
74    
75        REAL, INTENT(IN):: x
76        REAL, INTENT(OUT):: fval, fderiv
77    
78        fval = a0 + x * (a1 + x * (a2 + x * a3)) - abs_y
79        fderiv = a1 + x * (2. * a2 + x * 3. * a3)
80    
81    end subroutine fxhyp_loop_ik    END SUBROUTINE funcd
82    
83  end module fxhyp_loop_ik_m  end module invert_zoom_x_m
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