On Wed, Oct 6, 2010 at 1:06 PM, Michael Cracraft <michael.cracr...@gmail.com
> wrote:
> I have a code that continuously modifies a numpy.ndarray variable. Then, I
> use set_ydata on the matplotlib.lines.Line2D object to the same ndarray
> variable. Then, I call fig.canvas.draw() to redraw the figure, where fig is
> Figure object.
>
> However, the line on the graph never changes. I print a few entries to the
> console to make sure that the variable is changing.
>
> It seems like the only way I can get the line to update is to create a
> completely new ndarray, update that variable with the new values and use
> set_ydata on my line object. Then, the redraw works. Other things that I
> tried that didn't seem to work were:
>
> L1.set_ydata(x[:])
> L1.set_ydata(x.tolist())
> L1.set_ydata(list(x))
>
>
> where L1 is my line object, and x is my ndarray. To make it redraw I have
> to do something like this.
>
> xnew = numpy.zeros(numpy.size(x,0))
> for k in range(numpy.size(x,0)):
> xnew[k] = x[k]
> L1.set_ydata(xnew)
> fig.canvas.draw()
>
> Is there some switch I can set to force a redraw of the elements? I feel
> like I am missing something fundamental.
>
> Thanks,
> Michael
>
>
Michael,
Which version of matplotlib are you using? Which backend are you using?
Also, could you include a small script or two that demonstrate the problem?
This way, we can poke around with it and see what is up.
Ben Root
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