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diff --git a/modules/graphics/macros/check2dFun.sci b/modules/graphics/macros/check2dFun.sci
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+++ b/modules/graphics/macros/check2dFun.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 [nArgOut,vectInput]=check2dFun(funName,func,X,current_figure,cur_draw_mode)
+
+    // In this function we determine wether the function 'func'
+    // has the syntax [y]=func(x) or [x,y]=func(t).
+    // We also test if the function accepts vector input
+    // arguments.
+    //
+    // This allow to understand in a 2d plot function (plot)
+    // if the user has requested a 2d plot of a parametric or
+    // non-parametric curve.
+
+    // First We get the two strings in and out containing the
+    // names of input and output arguments :
+
+    [out,in,text]=string(func);
+
+    nArgOut=max(size(out));
+    nArgIn=max(size(in))
+
+    if nArgIn~=1
+        warning(sprintf("%s : function must accept two input arguments",funName));
+        ResetFigureDDM(current_figure, cur_draw_mode)
+        return;
+    end
+
+    if nArgOut~=1 & nArgOut~=2
+        warning(sprintf("%s : function must have 1 or 2 output arguments",funName));
+        ResetFigureDDM(current_figure, cur_draw_mode)
+        return;
+    end
+
+    // Now we test if func accepts vector inputs (we test with the X,Y
+    // pair provided by the user)
+
+    if nArgOut==1;
+
+        ierr=execstr("yf=func(X)","errcatch");
+        if ierr==0
+            vectInput=(and(size(yf)==size(X)));
+        else
+            vectInput=%F;
+        end
+
+    elseif nArgOut==2
+
+        // now we test if func accepts vector inputs (as above)
+
+        xf=[];yf=[];
+        ierr=execstr("[xf,yf]=func(X)","errcatch");
+
+        vectInput=(ierr==0 & and([size(xf)==size(yf) ...
+        size(yf)==size(X)]));
+    end
+
+endfunction