Re: Trouble installing control toolbox

[marco atzeri]

On 12/14/2012 2:22 AM, Michael Noone wrote:
> Hi Alexander - we're getting somewhere now! I installed gnuplot.
> However, the graph I'm getting is rather ugly... I tried switching to
> fltk and it did not change the output. Either way, I get an all text
> output. I used octave with the controls toolbox a few years ago and I
> remember getting nice looking graphs that popped up in an external
> window - do you have any idea how to set this up?

you need to start octave from inside an Xterm, not from a console like
Mintty. Otherwise you see on octave start
"warning: X11 DISPLAY environment variable not set"

To have graphics on cygwin you need to start the Xwin server.

> See below:
>
> octave:1> pkg load control
> octave:2> a = tf(1, [1 2 3])
>
> Transfer function 'a' from input 'u1' to output ...
>
>              1
>   y1:  -------------
>        s^2 + 2 s + 3
>
> Continuous-time model.
> octave:3> bode(a)

attached screen copy using gnuplot graphics

Regards
Marco

bode_screen.png
Description: PNG image