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See the recommended documentation of this function
magnitude of FIR and IIR filters
a single input, single output discrete transfer function, or a polynomial or the vector of polynomial coefficients, the filter.
a polynomial or the vector of polynomial coefficients, the numerator of the filter
a polynomial or the vector of polynomial coefficients, the denominator of the filter (the default value is 1).
integer, the number of points in frequency response.
vector of magnitude of frequency response at the points
points in the normalized frequency domain where magnitude is evaluated.
calculates the magnitude of the frequency responses of FIR and IIR filters. The filter description can be one or two vectors of coefficients, one or two polynomials, or a single output discrete transfer function.
the frequency discretisation is given by
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