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.

--

David Bateman

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