Hello. I have had an issue trying to plot an histogram with Matplotlib. The line is:
plt.hist([SNIa.angles, SNIbc.angles, SNII.angles], 11, range=[-pi, pi], normed=True,histtype='stepfilled',color=['g', 'r', 'b'],alpha=[1, 0.6, 1]) But the error is raised when I try to save the image. For completness, the whole program is here: http://nopaste.voric.com/paste.php?f=8zl9i4 If I call hist as stated above, I get the following error report: Traceback (most recent call last): File "C:\Documents and Settings\David\Escritorio\Python\IAYC\Supernovae\final\Deprecated\supernovae_bug.py", line 35, in <module> plt.savefig('angular_merged_1bis.png') File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 363, in savefig return fig.savefig(*args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 1084, in savefig self.canvas.print_figure(*args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\backend_bases.py", line 1886, in print_figure **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 438, in print_png FigureCanvasAgg.draw(self) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 394, in draw self.figure.draw(self.renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 798, in draw func(*args) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1934, in draw a.draw(renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\patches.py", line 366, in draw r, g, b, a = colors.colorConverter.to_rgba(self._facecolor, self._alpha) File "C:\Python25\Lib\site-packages\matplotlib\colors.py", line 353, in to_rgba raise ValueError('to_rgba: Invalid rgba arg "%s"\n%s' % (str(arg), exc)) ValueError: to_rgba: Invalid rgba arg "[ 0. 0.5 0. 1. ]" alpha must be in range 0-1 If I delete the color declaring, I get instead: Traceback (most recent call last): File "C:\Documents and Settings\David\Escritorio\Python\IAYC\Supernovae\final\Deprecated\supernovae_bug.py", line 35, in <module> plt.savefig('angular_merged_1bis.png') File "C:\Python25\Lib\site-packages\matplotlib\pyplot.py", line 363, in savefig return fig.savefig(*args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 1084, in savefig self.canvas.print_figure(*args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\backend_bases.py", line 1886, in print_figure **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 438, in print_png FigureCanvasAgg.draw(self) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 394, in draw self.figure.draw(self.renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\figure.py", line 798, in draw func(*args) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\axes.py", line 1934, in draw a.draw(renderer) File "C:\Python25\Lib\site-packages\matplotlib\artist.py", line 55, in draw_wrapper draw(artist, renderer, *args, **kwargs) File "C:\Python25\Lib\site-packages\matplotlib\patches.py", line 383, in draw renderer.draw_path(gc, tpath, affine, rgbFace) File "C:\Python25\Lib\site-packages\matplotlib\backends\backend_agg.py", line 117, in draw_path self._renderer.draw_path(gc, path, transform, rgbFace) TypeError: float() argument must be a string or a number And works fine without alpha statement. Any change in the other arguments does not make any difference on the behaviour. If I run it from the IDLE, once I get an error, I continue getting it even if the problematic part is fixed, until I restart the program. I am running Matplotlib 1.0.0 y Python 2.5 sobre WXP. I haven't find any reference to this in the documentation, so it seems to be a bug. Regards, David. ------------------------------------------------------------------------------ This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
