Re: plotting while preserving some properties

[David Bateman]

Giovanni Di Stasi wrote:
> Hi,
>
> I am using Octave and Gnuplot in order to draw a "moving" graph; I'm doing 
> that by calling repeatedly plot(X) and replot() with the new matrix; Between 
> a plot and the next, I'd like the title, the ylabel and the xlabel to be 
> preserved (without having to call title(...), xlabel(...) and ylabel(...) 
> every time). How can I do that?
>
> Another question: I call my script from bash (I made it executable and put 
> #! /usr/bin/octave -qf at the beginning) and, as I said above, I have to call 
> both plot and replot (If I just call plot, the figure won't even show up), 
> whilst, in the Octave command line, plot is sufficient. Shouldn't plot be 
> enough in both cases?
>
> Many thanks.
>
> I'm using:
> GNU Octave, version 3.0.0
> Gnuplot Version 4.2 patchlevel 2
>
>   

In the repository this can be done with something like

          x = 0:0.1:10;
          y = sin (x);
          plot (x, y, "ydatasource", "y");
          xlabel ("x");
          ylabel("y");
          title ("This is a moving plot");
          for i = 1 : 100
            pause(0.1)
            y = sin (x + 0.1 * i);
            refreshdata();
          endfor

though not in 3.0.x. For 3.0.x you can try something like

          x = 0:0.1:10;
          y = sin (x);
          h = plot (x, y);
          xlabel ("x");
          ylabel("y");
          title ("This is a moving plot");
          for i = 1 : 100
            drawnow ();
            pause(0.1)
            y = sin (x + 0.1 * i);
            set (h, "ydata", y);
          endfor

D.




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