/[lmdze]/trunk/dyn3d/invert_zoom_x.f
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trunk/Sources/dyn3d/invert_zoom_x.f revision 149 by guez, Thu Jun 18 12:23:44 2015 UTC trunk/dyn3d/invert_zoom_x.f revision 255 by guez, Tue Mar 6 13:39:57 2018 UTC
# Line 9  module invert_zoom_x_m Line 9  module invert_zoom_x_m
9    
10  contains  contains
11    
12    subroutine invert_zoom_x(xf, xtild, G, xlon, xprim, xuv)    subroutine invert_zoom_x(beta, xf, xtild, G, xlon, xprim, xuv)
13    
14      use coefpoly_m, only: coefpoly, a1, a2, a3      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, grossismx
17      use nr_util, only: pi_d, twopi_d      use nr_util, only: pi_d, twopi_d
18      use numer_rec_95, only: hunt, rtsafe      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):: beta, Xf(0:), xtild(0:), G(0:) ! (0:nmax)
21    
22      real, intent(out):: xlon(:), xprim(:) ! (iim)      real, intent(out):: xlon(:), xprim(:) ! (iim)
23    
# Line 28  contains Line 28  contains
28    
29      ! Local:      ! Local:
30      DOUBLE PRECISION Y      DOUBLE PRECISION Y
31        DOUBLE PRECISION h ! step of the uniform grid
32      integer i, it      integer i, it
33    
34      real xvrai(iim), Gvrai(iim)      DOUBLE PRECISION xvrai(iim), Gvrai(iim)
35      ! intermediary variables because xlon and xprim are simple precision      ! intermediary variables because xlon and xprim are single precision
36    
37      !------------------------------------------------------------------      !------------------------------------------------------------------
38    
39        print *, "Call sequence information: invert_zoom_x"
40      it = 0 ! initial guess      it = 0 ! initial guess
41        h = twopi_d / iim
42    
43      DO i = 1, iim      DO i = 1, iim
44         Y = - pi_d + (i + xuv - 0.75d0) * twopi_d / iim         Y = - pi_d + (i + xuv - 0.75d0) * h
45         ! - pi <= y < pi         ! - pi <= y < pi
46         abs_y = abs(y)         abs_y = abs(y)
47    
48         call hunt(xf, abs_y, it, my_lbound = 0)         ! Distinguish boundaries in order to avoid roundoff error.
49         ! {0 <= it <= nmax - 1}         ! funcd should be exactly equal to 0 at xtild(it) or xtild(it +
50           ! 1) and could be very small with the wrong sign so rtsafe
51           ! would fail.
52           if (abs_y == 0d0) then
53              xvrai(i) = 0d0
54              gvrai(i) = grossismx
55           else if (abs_y == pi_d) then
56              xvrai(i) = pi_d
57              gvrai(i) = 2d0 * beta - grossismx
58           else
59              call hunt(xf, abs_y, it, my_lbound = 0)
60              ! {0 <= it <= nmax - 1}
61    
62              ! Calcul de xvrai(i) et Gvrai(i)
63              CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &
64                   xtild(it + 1))
65              xvrai(i) = rtsafe(funcd, xtild(it), xtild(it + 1), xacc = 1d-6)
66              Gvrai(i) = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)
67           end if
68    
        ! Calcul de xvrai(i) et Gvrai(i)  
        CALL coefpoly(Xf(it), Xf(it + 1), G(it), G(it + 1), xtild(it), &  
             xtild(it + 1))  
        xvrai(i) = rtsafe(funcd, real(xtild(it)), real(xtild(it + 1)), &  
             xacc = 1e-6)  
        Gvrai(i) = a1 + xvrai(i) * (2d0 * a2 + xvrai(i) * 3d0 * a3)  
69         if (y < 0d0) xvrai(i) = - xvrai(i)         if (y < 0d0) xvrai(i) = - xvrai(i)
70      end DO      end DO
71    
# Line 62  contains Line 77  contains
77      END DO      END DO
78    
79      xlon = xvrai + clon      xlon = xvrai + clon
80      xprim = twopi_d / (iim * Gvrai)      xprim = h / Gvrai
81    
82    end subroutine invert_zoom_x    end subroutine invert_zoom_x
83    
# Line 72  contains Line 87  contains
87    
88      use coefpoly_m, only: a0, a1, a2, a3      use coefpoly_m, only: a0, a1, a2, a3
89    
90      REAL, INTENT(IN):: x      DOUBLE PRECISION, INTENT(IN):: x
91      REAL, INTENT(OUT):: fval, fderiv      DOUBLE PRECISION, INTENT(OUT):: fval, fderiv
92    
93      fval = a0 + x * (a1 + x * (a2 + x * a3)) - abs_y      fval = a0 + x * (a1 + x * (a2 + x * a3)) - abs_y
94      fderiv = a1 + x * (2. * a2 + x * 3. * a3)      fderiv = a1 + x * (2d0 * a2 + x * 3d0 * a3)
95    
96    END SUBROUTINE funcd    END SUBROUTINE funcd
97    
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