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+
+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) 1999 - INRIA - Carlos Klimann
+// corrected by bruno pincon (2006-08-16) (fix for bug 2092)
+//
+// 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 [s2]=mad(x,orien)
+    //
+    //This function   computes the mean  absolute  deviation of a  vector or
+    //matrix x.
+    //
+    //For  a vector or  matrix x,  s2=mad(x)  returns in scalar s2  the mean
+    //absolute deviation of all the entries of x.
+    //
+    //s2=mad(x,'r')(or, equivalently,  s2=mad(x,1)) returns in each entry of
+    //the column vector s2 the mean absolute deviation of each column of x.
+    //
+    //s2=mad(x,'c')(or, equivalently, s2=mad(x,2))  returns in each entry of
+    //the column vector s2 the mean absolute deviation of each row of x.
+    //
+    //Reference: Wonacott  T.H.& Wonacott  R.J. .-  Introductory Statistics,
+    //5th edition, John Wiley, 1990.
+    //
+    //References:  Wonacott, T.H. & Wonacott, R.J.; Introductory
+    //Statistics, J.Wiley & Sons, 1990.
+    //
+    [lhs,rhs]=argn()
+    if rhs < 1 | rhs > 2 then
+        error(msprintf(gettext("%s: Wrong number of input argument: %d to %d expected.\n"),"mad",1,2)),
+    end
+
+    if x==[] then s2=%nan, return, end
+
+    [nrow,ncol] = size(x);
+    if rhs==1 then
+        s2=sum(abs(x-mean(x)))/(nrow*ncol)
+    else // rhs == 2
+        if orien=="r" | orien==1 then
+            s2=sum(abs(x-(ones(nrow,1)*mean(x,1))),1)/nrow
+        elseif orien=="c" | orien==2 then
+            s2=sum(abs(x-(mean(x,2)*ones(1,ncol))),2)/ncol
+        else
+            error(msprintf(gettext("%s: Wrong value for input argument #%d: ''%s'', ''%s'', %d or %d expected.\n"),"mad",2, "r","c",1,2)),
+        end
+    end
+endfunction