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function [b_out, a_out] = impinvar (b, a, fs, tol)
//This function converts analog filter with coefficients b and a to digital, conserving impulse response.
//Calling Sequence
//[b, a] = impinvar (b, a)
//[b, a] = impinvar (b, a, fs)
//[b, a] = impinvar (b, a, fs, tol)
//Parameters
//b: real or complex valued scalar or vector
//a: real or complex valued scalar or vector, order should be greater than b
//fs: real or complex value, default value 1Hz
//tol: real or complex value, default value 0.0001
//Description
//This is an Octave function.
//This function converts analog filter with coefficients b and a to digital, conserving impulse response.
//This function does the inverse of impinvar.
//Examples
//b = 0.0081000
//a = [2.0000000, 0.56435378, 0.4572792, 0.00705544, 0.091000]
//[ay,by] = impinvar(b,a,10)
//ay =
// 0.0000e+00 7.5293e-08 2.9902e-07 7.4238e-08
//by =
// 1.00000 -3.96992 5.91203 -3.91428 0.97218
funcprot(0);
rhs = argn(2)
if(rhs<2)
error("Wrong number of input arguments.")
end
select(rhs)
case 2 then
[b, a] = callOctave("impinvar",b,a)
case 3 then
[b, a] = callOctave("impinvar",b,a,fs)
case 4 then
[b, a] = callOctave("impinvar",b,a,fs,tol)
end
endfunction
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