RE: bode not working: sys undefined

[dastew]

Ya a little more reading :-)

The control system tool box handles multiple input multiple output state space transfer functions.
So if you have 2 inputs and 3 outputs you would have to tell it which input and which output that you want to analyse and get a bode plot from. At the time that you create the system you can give each input and each output a meaningful name and then use it.

I do not see the overlap in the bode plot labels that you saw so maybe I have a newer gnuplot??

Doug




> From: address@hidden
> To: address@hidden; address@hidden
> Date: Sun, 11 Oct 2009 09:34:10 +0800
> Subject: RE: bode not working: sys undefined
>
> From: address@hidden address@hidden
>
> Here is an example:
>
> n=6
> d=[1 2 6]
> sys=tf(n,d);
> sysout(sys)
> bode(sys)
>
> This works now, in principle.
>
> Back to the earlier question, the example provided here:
>
> > https://prof.hti.bfh.ch/sha1/Octave/index/f/bode.html
>
> bode(sys,[],"y_3", {"u_1","u_4"});
>
> Is this an explanation or valid syntax? At first sight, it does look like valid syntax. But when I run it:
> octave:17> bode(sys,[],"y_3", {"u_1","u_4"});
> error: sysidx (sigtype = in): Did not find u_4
> I have to do more reading, I guess. What puzzles me, is that it complains about u_4. Does it evaluate from right to left? Would "u_4" not be simply a string?
>
> Uwe
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