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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA - 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_V2.1-en.txt
function [h]=buttmag(order,omegac,sample_vector)
//<h>=buttmag(order,omegac,sample_vector)
//Squared Magnitude response of a Butterworth filter
//omegac = cutoff frequency ; sample_vector = sample of frequencies
// order :Filter order
// omegac :Cut-off frequency in Hertz
// sample_vector :Vector of frequency where buttmag is evaluated
// h :Butterworth filter values at sample points
//
//!
// For ascendant compatibility before bug 4618 fix
// http://bugzilla.scilab.org/show_bug.cgi?id=4618
// In case the users calls buttmag with named arguments
if exists("sample","local")==1 then
sample_vector = sample;
end
[n1,n2]=size(sample_vector);
un=ones(n1,n2);
h=un./(un+(sample_vector/omegac).^(2*order));
endfunction
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