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diff --git a/modules/graphics/macros/fgrayplot.sci b/modules/graphics/macros/fgrayplot.sci
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+++ b/modules/graphics/macros/fgrayplot.sci
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+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) INRIA
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
+
+function []=fgrayplot(x,y,f,strf,rect,nax,void)
+    //[]=fgrayplot(x,y,f)
+    // Trace en niveau de gris une surface
+    // z=f(x,y) d\'efinie par un external f ( ex macro [y]=f(x))
+    // on calcule d'abord f sur la grille definie par x.y
+    // x et y sont des vecteurs implicites donnant les
+    // abscisses et les ordonn\'ees des points de la grille
+    // le niveau de gris choisi sur chaque maillage depend de la valeur
+    //    moyenne de z dans le maillage.
+    // Exemple : taper fgrayplot() pour voir un exemple .
+    //    deff('[z]=Surf(x,y)','z=x**2+y**2');
+    //    fgrayplot(-1:0.1:1,-1:0.1:1,Surf);
+    //!
+
+    [lhs,rhs]=argn(0);
+
+    if rhs <= 0 then   // demo
+        deff("[z]=Surf(x,y)","z=cos(x).^2+sin(y).^2");
+        fgrayplot(-%pi:0.1:%pi,-%pi:0.1:%pi, Surf);
+        f = gcf();
+        f.color_map = coolcolormap(100);
+        return
+    end
+
+
+    if rhs<3,
+        error(msprintf(gettext("%s: Wrong number of input argument(s): At least %d expected.\n"), "fgrayplot", 3));
+    end
+
+
+    opts=[]
+    if exists("style","local")==1 then opts=[opts,"style=style"],end
+    if exists("strf","local")==1 then opts=[opts,"strf=strf"],end
+    if exists("rect","local")==1 then opts=[opts,"rect=rect"],end
+    if exists("nax","local")==1 then opts=[opts,"nax=nax"],end
+    if exists("frameflag","local")==1 then opts=[opts,"frameflag=frameflag"],end
+    if exists("axesflag","local")==1 then opts=[opts,"axesflag=axesflag"],end
+
+    if type(f)==11 then comp(f),end;
+    execstr("grayplot(x,y,feval(x,y,f),"+strcat(opts,",")+")")
+endfunction