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//Author: Parthasarathi Panda
//parthasarathipanda314@gmail.com
// This function checks whether given system function is FIR or not
//. Calling Sequence
// fir = isfir(b,a)
// fir = isfir(sos)
// Input Parameters
// a -->denumerator coefficient matrix
// b --> numerator coefficient matrix
// sos --> second order split matrix
// Output parameter
// fir --> fir == 1 if system is FIR , fir == 0 if system is not FIR
//Description
// This function take a system function (in terms of denumerator and numerator coefficient matrix or in term of second order split (sos) matrix) as input and checks
//Example
// 1.)
// fir = isfir([1 -1 1], 1)
//-->fir = isfir([1 -1 1],1)
// fir =
//
// 1.
//Conclusion : Output of above example is fir = 1 this means system is FIR
function fir=isfir(varargin)
[nargout,nargin]=argn();
// checking for input in terms of numerator (b) and denumerator (a) coefficient matrices
if (nargin==2) then
a=varargin(1);
b=varargin(2);
if type(a)~=1 | type(b)~=1 then
error('check input type');
end
v=size(a);
if length(v)>2 then
error('check input dimension');
end
v=size(b);
if length(v)>2 then
error('check input dimension');
end
[n,k]=size(a);
if k==1 then
a=a';
elseif n~=1 then
error('check input dimension');
end
[n,k]=size(b);
if k==1 then
b=b';
k=n;
elseif n~=1 then
error('check input dimension');
end
//Checking for input in terms of second orer split (sos) matrix
elseif (nargin==1) then
sos=varargin(1);
if type(sos)~=1 then
error('check input dimension');
end
v=size(sos);
if length(v)>2 then
error('check input dimension');
end
if v(2)~=6 then
error('no. of columns must be 6');
end
a=1;b=1;
for i=[1:v(1)]
a=convol(a,sos(1:3));
b=convol(b,sos(4:6));
end
else
error('no. of inputs not matching');
end
if length(b)==1 then
fir=1;
else
fir=0;
end
endfunction
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