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function y = fftconv(X, Y, varargin)
//Convolve two vectors using the FFT for computation.
//Calling Sequence
//Y = fftconv(X, Y)
//Y = fftconv(X, Y, N)
//Parameters
//X, Y: Vectors
//Description
//Convolve two vectors using the FFT for computation. 'c' = fftconv (X, Y)' returns a vector of length equal to 'length(X) + length (Y) - 1'. If X and Y are the coefficient vectors of two polynomials, the returned value is the coefficient vector of the product polynomial.
//Examples
//fftconv([1,2,3], [3,4,5])
//ans =
// 3. 10. 22. 22. 15.
funcprot(0);
rhs = argn(2)
if(rhs<2 | rhs>3)
error("Wrong number of input arguments.");
end
select(rhs)
case 2 then
y = callOctave("fftconv", X, Y);
case 3 then
y = callOctave("fftconv",X, Y, varargin(1));
end
endfunction
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