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 <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 > > -- > _____________________________________________ > > ------------------------------------------------------------------------------ > Beautiful is writing same markup. Internet Explorer 9 supports > standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. > Spend less time writing and rewriting code and more time creating great > experiences on the web. Be a part of the beta today. > http://p.sf.net/sfu/beautyoftheweb > _______________________________________________ > Matplotlib-users mailing list > Matplotlib-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-users > > ------------------------------------------------------------------------------ Beautiful is writing same markup. Internet Explorer 9 supports standards for HTML5, CSS3, SVG 1.1, ECMAScript5, and DOM L2 & L3. Spend less time writing and rewriting code and more time creating great experiences on the web. Be a part of the beta today. http://p.sf.net/sfu/beautyoftheweb _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
