How to change line specifications for frequency response?

Hi everybody,

I would like to plot a response to an initial condition in the frequency domain such as:

initial(G1,initial_state,'k','--')

However, even though I can change the graph color, I can not change the line type or line width and get the following error: "Invalid syntax for time or frequency response command."

Does anybody know how to adapt plot specifications?

Thank you in advance!

Nicolas

Answer 1

[Star Strider]

The Control System Toolbox and System Identification Toolbox graphics functions do not generally allow you alter their properties.

The easiest work-around is to get the outputs of the functions and plot them yourself in ordinary plot (or subplot) calls:

[y,t,x] = initial(G1, initial_state);

figure(1)
plot(t, y,    t, zeros(numel(t),1),':')

You can do everything with that plot that you can do with any other plot object.

[Nicolas Ochmann]

That works! Thanks :)

[Star Strider]

As always, my pleasure!