Re: [Matplotlib-users] Issue with Redrawing a Line (numpy.ndarray, set_ydata, and draw)

[Michael C. <mic...@gm...>]

You are correct about the version.  I was just working with the version
installed on Fedora 13, and the recache works.  Looks like a working
solution for now.

Thanks,
Michael


On Wed, Oct 6, 2010 at 8:18 PM, Jae-Joon Lee <lee...@gm...> wrote:

> I believe that you're using older version of mpl (<1.0) and this is a
> known issues, which has been fixed.
>
>
> http://sourceforge.net/tracker/?func=detail&aid=2917758&group_id=80706&atid=560720
>
> Try to add
>
> L1.recache()
>
> after set_ydata.
>
> Regards,
>
> -JJ
>
>
>
> On Thu, Oct 7, 2010 at 3:06 AM, Michael Cracraft
> <mic...@gm...> 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
> >
> > --
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