--- trunk/dyn3d/coefpoly.f90	2014/03/05 14:38:41	81
+++ trunk/dyn3d/coefpoly.f	2015/02/05 12:41:08	123
@@ -1,39 +1,50 @@
+module coefpoly_m
 
-! $Header: /home/cvsroot/LMDZ4/libf/dyn3d/coefpoly.F,v 1.1.1.1 2004/05/19
-! 12:53:05 lmdzadmin Exp $
-
-SUBROUTINE coefpoly(xf1, xf2, xprim1, xprim2, xtild1, xtild2, a0, a1, a2, a3)
   IMPLICIT NONE
 
-  ! ...  Auteur :   P. Le Van  ...
+contains
+
+  SUBROUTINE coefpoly(xf1, xf2, xprim1, xprim2, xtild1, xtild2, a0, a1, a2, a3)
+
+    ! From LMDZ4/libf/dyn3d/coefpoly.F, version 1.1.1.1 2004/05/19 12:53:05
+
+    ! Author: P. Le Van
+
+    ! Calcul des coefficients a0, a1, a2, a3 du polynôme de degré 3 qui
+    ! satisfait aux 4 équations suivantes :
+
+    ! a0 + a1 * xtild1 + a2 * xtild1**2 + a3 * xtild1**3 = Xf1
+    ! a0 + a1 * xtild2 + a2 * xtild2**2 + a3 * xtild2**3 = Xf2
+    ! a1 + 2. * a2 * xtild1 + 3. * a3 * xtild1**2 = Xprim1
+    ! a1 + 2. * a2 * xtild2 + 3. * a3 * xtild2**2 = Xprim2
+
+    ! (passe par les points (Xf(it), xtild(it)) et (Xf(it + 1),
+    ! xtild(it + 1))
 
+    ! On en revient à resoudre un système de 4 équations à 4 inconnues
+    ! a0, a1, a2, a3.
 
-  ! Calcul des coefficients a0, a1, a2, a3 du polynome de degre 3 qui
-  ! satisfait aux 4 equations  suivantes :
+    DOUBLE PRECISION, intent(in):: xf1, xf2, xprim1, xprim2, xtild1, xtild2
+    DOUBLE PRECISION, intent(out):: a0, a1, a2, a3
 
-  ! a0 + a1*xtild1 + a2*xtild1*xtild1 + a3*xtild1*xtild1*xtild1 = Xf1
-  ! a0 + a1*xtild2 + a2*xtild2*xtild2 + a3*xtild2*xtild2*xtild2 = Xf2
-  ! a1  +     2.*a2*xtild1 +     3.*a3*xtild1*xtild1 = Xprim1
-  ! a1  +     2.*a2*xtild2 +     3.*a3*xtild2*xtild2 = Xprim2
+    ! Local:
+    DOUBLE PRECISION xtil1car, xtil2car, derr, x1x2car
 
-  ! On en revient a resoudre un systeme de 4 equat.a 4 inconnues a0,a1,a2,a3
+    !------------------------------------------------------------
 
-  DOUBLE PRECISION xf1, xf2, xprim1, xprim2, xtild1, xtild2, xi
-  DOUBLE PRECISION xfout, xprim
-  DOUBLE PRECISION a1, a2, a3, a0, xtil1car, xtil2car, derr, x1x2car
+    xtil1car = xtild1 * xtild1
+    xtil2car = xtild2 * xtild2
 
-  xtil1car = xtild1*xtild1
-  xtil2car = xtild2*xtild2
+    derr = 2. * (xf2-xf1)/(xtild1-xtild2)
 
-  derr = 2.*(xf2-xf1)/(xtild1-xtild2)
+    x1x2car = (xtild1-xtild2) * (xtild1-xtild2)
 
-  x1x2car = (xtild1-xtild2)*(xtild1-xtild2)
+    a3 = (derr+xprim1+xprim2)/x1x2car
+    a2 = (xprim1-xprim2+3. * a3 * (xtil2car-xtil1car))/(2. * (xtild1-xtild2))
 
-  a3 = (derr+xprim1+xprim2)/x1x2car
-  a2 = (xprim1-xprim2+3.*a3*(xtil2car-xtil1car))/(2.*(xtild1-xtild2))
+    a1 = xprim1 - 3. * a3 * xtil1car - 2. * a2 * xtild1
+    a0 = xf1 - a3 * xtild1 * xtil1car - a2 * xtil1car - a1 * xtild1
 
-  a1 = xprim1 - 3.*a3*xtil1car - 2.*a2*xtild1
-  a0 = xf1 - a3*xtild1*xtil1car - a2*xtil1car - a1*xtild1
+  END SUBROUTINE coefpoly
 
-  RETURN
-END SUBROUTINE coefpoly
+end module coefpoly_m