/[lmdze]/trunk/dyn3d/invert_zoom_x.f
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revision 148 by guez, Wed Jun 17 16:40:24 2015 UTC revision 150 by guez, Thu Jun 18 13:49:26 2015 UTC
# Line 3  module invert_zoom_x_m Line 3  module invert_zoom_x_m
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 invert_zoom_x(xf, xtild, G, xlon, xprim, 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      use dynetat0_m, only: clon
17      use nr_util, only: pi_d, twopi_d      use nr_util, only: pi_d, twopi_d
18      use numer_rec_95, only: hunt      use numer_rec_95, only: hunt, rtsafe
19    
20      DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), G(0:) ! (0:nmax)      DOUBLE PRECISION, intent(in):: Xf(0:), xtild(0:), G(0:) ! (0:nmax)
21    
# Line 24  contains Line 27  contains
27      ! 0.5 si calcul aux points U      ! 0.5 si calcul aux points U
28    
29      ! Local:      ! Local:
30      DOUBLE PRECISION Y, abs_y, a0, a1, a2, a3      DOUBLE PRECISION Y
31      integer i, it, iter      integer i, it
     real, parameter:: my_eps = 1e-6  
32    
33      real xo1, Xf1      DOUBLE PRECISION xvrai(iim), Gvrai(iim)
     real xvrai(iim), Gvrai(iim)  
34      ! intermediary variables because xlon and xprim are simple precision      ! intermediary variables because xlon and xprim are simple precision
35    
36      !------------------------------------------------------------------      !------------------------------------------------------------------
# Line 45  contains Line 46  contains
46         ! {0 <= it <= nmax - 1}         ! {0 <= it <= nmax - 1}
47    
48         ! Calcul de xvrai(i) et Gvrai(i)         ! Calcul de xvrai(i) et Gvrai(i)
   
49         CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &         CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &
50              xtild(it + 1), a0, a1, a2, a3)              xtild(it + 1))
51         xvrai(i) = xtild(it)         xvrai(i) = rtsafe(funcd, xtild(it), xtild(it + 1), xacc = 1d-6)
52         Xf1 = Xf(it)         Gvrai(i) = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)
        Gvrai(i) = G(it)  
        xo1 = xvrai(i)  
        iter = 1  
   
        do  
           xvrai(i) = xvrai(i) - (Xf1 - abs_y) / Gvrai(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))  
           Gvrai(i) = 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, abs_y  
           STOP 1  
        end if  
   
53         if (y < 0d0) xvrai(i) = - xvrai(i)         if (y < 0d0) xvrai(i) = - xvrai(i)
54      end DO      end DO
55    
# Line 84  contains Line 65  contains
65    
66    end subroutine invert_zoom_x    end subroutine invert_zoom_x
67    
68      !**********************************************************************
69    
70      SUBROUTINE funcd(x, fval, fderiv)
71    
72        use coefpoly_m, only: a0, a1, a2, a3
73    
74        DOUBLE PRECISION, INTENT(IN):: x
75        DOUBLE PRECISION, INTENT(OUT):: fval, fderiv
76    
77        fval = a0 + x * (a1 + x * (a2 + x * a3)) - abs_y
78        fderiv = a1 + x * (2d0 * a2 + x * 3d0 * a3)
79    
80      END SUBROUTINE funcd
81    
82  end module invert_zoom_x_m  end module invert_zoom_x_m
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