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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 [num, den] = zp2tf (z, p, k)
//Converts zeros / poles to a transfer function.
//Calling Sequence
//[num, den] = zp2tf (z, p, k)
//num = zp2tf (z, p, k)
//Parameters
//z: Zeros
//p: Poles
//k: Leading coefficient (Gain)
//Num: Numerator coefficients of the transfer function
//den: Denomenator coefficients of the transfer function
//Description
//It converts zeros / poles representation to transfer function representation.
//Examples
//z = [1 2 3]
//p = [4 5 6]
//k = 5
//[num, den] = zp2tf (z, p, k)
//Output :
// den =
//
// 1. - 15. 74. - 120.
// num =
//
// 5. - 30. 55. - 30.
funcprot(0);
lhs = argn(1)
rhs = argn(2)
if (rhs < 3 | rhs > 3)
error("zp2tf : Wrong number of input arguments.")
end
n = k*real(poly(z,"x"));
d = real(poly(p, "x"));
num = coeff(n);
num = flipdim(num,2);
den = coeff(d);
den = flipdim(den,2);
endfunction
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