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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA - 1988 - F.D
//
// 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 cels=casc(x,z)
//cels=casc(x,z)
//Creates cascade realization of filter
//from a matrix of coefficients
// x :(4xN)-Matrix where each column is a cascade
// :element, the first two column entries being
// :the numerator coefficients and the second two
// :column entries being the denominator coefficients
// z :Character string representing the cascade variable
// cels :Resulting cascade representation
//
//EXAMPLE:
// x=[ 1. 2. 3. ;
// 4. 5. 6. ;
// 7. 8. 9. ;
// 10. 11. 12. ]
//
// cels=casc(x,'z')
// cels =
//
// ! 2 2 2 !
// ! 1 + 4z + z 2 + 5z + z 3 + 6z + z !
// ! ------------ ------------ ------------ !
// ! 2 2 2 !
// ! 7 + 10z + z 8 + 11z + z 9 + 12z + z !
//!
cels=[];
for col=x,
nf=[col(1:2);1];
nd=[col(3:4);1];
cels=[cels,syslin([],poly(nf,'z','c'),poly(nd,'z','c'))];
end,
endfunction
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