step response initial condition
watertreader,
You are corrected with respect to step response. However, frequency response addresses the response to sinusoidal signals of various frequencies. In particular, frequency response addresses two parameters:
. The amplitude vs frequency
. The phase (with respect to the input) vs frequency.
Typically the freequency response is plotted as a "Bode plot" in which the frequency is depicted on a logarithmic horizontal scale. The amplitude is depicted in decibels (db) on a vertical scale. The phase is depicted as either degrees or radians on a linear vertical scale.
Regards,
Kral