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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-en.txt
function w=sdiff(z,d)
// time serie diiferencing
// W= (1-B)^d Z
// where B is the backward-shift operator
// and d the difrenecing order
// z : a matrix of size(n1,n2) z(t)=z(:,t)
[lhs,rhs]=argn(0)
if rhs==1;d=1;end
w=z;
for i=1:d,[n1,n2]=size(w); w=w(:,2:n2)-w(:,1:(n2-1));end
endfunction
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