Since version, 1.2 the following modified codes provided by Dr. Jose
Paulo Vilela Soares da Cunha have been included. These enable a user
to plot various frequency domain plots (Bode, magnitude, Nyquist,
Nichols etc) in both Hz. and rad/sec. (as opposed to Hz only in
native Scilab functions). Users may address queries about these codes
to the author at jpaulo@ieee.org