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// Copyright (C) 2018 - IIT Bombay - FOSSEE
//
// 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
// Author:Sonu Sharma, RGIT Mumbai
// Organization: FOSSEE, IIT Bombay
// Email: toolbox@scilab.in
function [z, p, g] = buttap (n)
//Produces analog prototype Butterworth filter
//Calling Sequence
//[z, p, g] = buttap (n)
//Parameters
//n: Filter Order
//z: Zeros
//p: Poles
//g: Gain
//Description
//It gives a lowpass analog prototype Butterworth filter of nth order.
//Examples
//[z, p, g] = buttap(5)
//Output :
// g =
//
// 1.
// p =
//
// - 0.3090170 - 0.9510565i
// - 0.8090170 - 0.5877853i
// - 1. - 1.225D-16i
// - 0.8090170 + 0.5877853i
// - 0.3090170 + 0.9510565i
// z =
//
// []
funcprot(0);
lhs = argn(1)
rhs = argn(2)
if (rhs < 1 | rhs > 1)
error("buttap: Wrong number of input arguments.")
end
[Hs, p, z, g] = analpf(n, "butt", [],1 );
p = p' ;
z = z' ;
endfunction
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