Re: Trouble installing control toolbox

[Alexander Hansen]

On 12/13/12 6:22 PM, 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?
> 
> 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)
> +-------------------------------Bode Diagram of
> a------------------------------+
> |    Magnitude
> [dB]                                                            |
> |     -10
> ++----+---+-+-+-+++++-----+---+--+-++-++++-----+--+--+-++-++++       |
> |     -20
> ++..................+.....+++++++........+..................++       |
> |     -30
> ++..............................++++++......................++       |
> |     -40
> ++...................................+++++++................++       |
> |     -50
> ++.........................................+++++++..........++       |
> |     -60
> ++...............................................++++++.....++       |
> |     -70
> ++..................+....................+............++++++++       |
> |     -80
> +-1---+---+-+-+-+++++0----+---+--+-++-++++1----+--+--+-++-++++2      |
> |        10                  10                   10                 
> 10       |
> |   Phase
> [deg]                                                                |
> |       0
> ++----+---+-+-+-+++++-----+---+--+-++-++++-----+--+--+-++-++++       |
> |     -20
> ++.....++++++++++++++....................+..................++       |
> |     -60
> ++.................+++++....................................++       |
> |     -80
> ++.....................+++..................................++       |
> |    -100
> ++.......................++++...............................++       |
> |    -140
> ++..........................+++++...........................++       |
> |    -160
> ++..................+...........+++++++++++++++.............++       |
> |    -180
> +-1---+---+-+-+-+++++0----+---+--+-++-++++1----+--+--+-++-++++2      |
> |        10                  10                   10                 
> 10       |
> +------------------------------------------------------------------------------+
> octave:4> graphics_toolkit
> ans = gnuplot
> octave:5> graphics_toolkit('fltk')
> octave:6> bode(a)
> +-------------------------------Bode Diagram of
> a------------------------------+
> |    Magnitude
> [dB]                                                            |
> |     -10
> ++----+---+-+-+-+++++-----+---+--+-++-++++-----+--+--+-++-++++       |
> |     -20
> ++..................+.....+++++++........+..................++       |
> |     -30
> ++..............................++++++......................++       |
> |     -40
> ++...................................+++++++................++       |
> |     -50
> ++.........................................+++++++..........++       |
> |     -60
> ++...............................................++++++.....++       |
> |     -70
> ++..................+....................+............++++++++       |
> |     -80
> +-1---+---+-+-+-+++++0----+---+--+-++-++++1----+--+--+-++-++++2      |
> |        10                  10                   10                 
> 10       |
> |   Phase
> [deg]                                                                |
> |       0
> ++----+---+-+-+-+++++-----+---+--+-++-++++-----+--+--+-++-++++       |
> |     -20
> ++.....++++++++++++++....................+..................++       |
> |     -60
> ++.................+++++....................................++       |
> |     -80
> ++.....................+++..................................++       |
> |    -100
> ++.......................++++...............................++       |
> |    -140
> ++..........................+++++...........................++       |
> |    -160
> ++..................+...........+++++++++++++++.............++       |
> |    -180
> +-1---+---+-+-+-+++++0----+---+--+-++-++++1----+--+--+-++-++++2      |
> |        10                  10                   10                 
> 10       |
> +------------------------------------------------------------------------------+
> 
> 
> 
> On Thu, Dec 13, 2012 at 4:44 PM, Alexander Hansen
> <address@hidden <mailto:address@hidden>> wrote:
> 
>     graphics_toolkit 
> 
> 

Hmm...that looks like your gnuplot is configured with a text-based
default terminal.  You could try to run gnuplot from a cygwin window and
use the "help terminal" command to see what options are available.  Then
something like

env GNUTERM="<termname>" octave

will have Octave use the "termname" terminal.

I'm not on Windows, so knowing the defaults is a bit outside of my
scope. :-)  One of the Cygwin-based folks should be able to give you
more info.

Also, try quitting, starting a new Octave session, and doing the
"graphics_toolkit('fltk')" operation before you plot.  Gnuplot didn't
disconnect, so you never actually plotted to the FLTK interface.  I had
the same results on my system.

-- 
Alex