Computes complex frequency response of the transfer function with Num in the numerator and Den in the denominator. The result is placed in the Response. Frequencies vector holds the frequencies [rad/sec] at which the frequency response should be evaluated. The requested frequencies should be logarithmically spaced, but this is not mandatory. More points can be specified in the areas where the frequency response changes rapidly.  

Optionally you can also specify the alpha parameter as in: 

s = alpha + j*Frequencies; 

The default value for alpha is zero.

FrequencyResponse

SignalUtils Methods