Examples
B = [1 2]; A = [1 1]; w = linspace(0,4,128); freqs(B,A,w); |  |  |
Compute the s-plane frequency response of the IIR filter.
h = freqs (b, a, w)
vector containing the coefficients of the numerator of the filter.
vector containing the coefficients of the denominator of the filter.
vector containing frequencies
This is an Octave function. It computes the s-plane frequency response of the IIR filter B(s)/A(s) as H = polyval(B,j*W)./polyval(A,j*W). If called with no output argument, a plot of magnitude and phase are displayed.
B = [1 2]; A = [1 1]; w = linspace(0,4,128); freqs(B,A,w); | | |