If the optional argument N is specified, an N-point FFT is used. The state vector is a column vector whose length is equal to the length of the longest coefficient vector minus one. If si is not set, the initial state vector is set to all zeros. The response is evaluated at 512 angular frequencies between 0 and The output value w is a vector containing the 512 frequencies. For fastest computation n should factor into a small number of small primes.
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