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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2002-2004 - INRIA - Vincent COUVERT
//
// 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 y=mtlb_diff(x,N,dim)
// Emulation function for Matlab diff()
[lhs,rhs]=argn()
if rhs==1 then N=1,end
if rhs<=2 then
if length(size(x))>2 then
dim=firstnonsingleton(x)
elseif size(x,1)==1 | size(x,2)==1 then
dim=0
else
dim="r"
end
end
if dim==0 then
y=diff(x,N)
else
if N>=size(x,"*") then
y=[]
return
else
for k=1:N
x=diff(x,1,dim)
if size(x,dim)==1 then
dim=firstnonsingleton(x)
end
end
end
if x==[] then
y=0
else
y=x
end
end
endfunction
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