system : an instance of the LTI class or a tuple describing the system.
The following gives the number of elements in the tuple and
- 2 (num, den)
- 3 (zeros, poles, gain)
- 4 (A, B, C, D)
w : array_like, optional
Array of frequencies (in rad/s). Magnitude and phase data is
calculated for every value in this array. If not given a reasonable
set will be calculated.
n : int, optional
Number of frequency points to compute if w is not given. The n
frequencies are logarithmically spaced in the range from two orders of
magnitude before the minimum (slowest) pole to two orders of magnitude
after the maximum (fastest) pole.