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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 [A,B,D]=arma2p(ar)
// Build three polynomial matrices
// from an ar representation
if ar(1)<>"ar" then
error(msprintf(gettext("%s: Wrong type for input argument #%d: %s data structure expected.\n"),..
"arma2p",1,"armax"));
end;
A=inv_coeff(ar(2));
if ar(3)<>[] then
[mb,nb]=size(ar(3));
B=inv_coeff(ar(3),(nb/ar("nu"))-1);
else
B=[];
end
D=inv_coeff(ar(4));
endfunction
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