Dear matplotlib-users, I'd like to report a bug in Polygon, which is crashing with an unhelpful error message where an exception would be appropriate. The problem occurs when you feed Polygon an Nx2 array instead of an N- length list of 2-tuples. This is on my PPC OSX system, with everything freshly checked out from SVN (should the matplotlib version still be 0.87.4?). Versions: In [152]: numpy.__version__ Out[152]: '1.1.2881' In [154]: matplotlib.__version__ Out[154]: '0.87.4' Code: import pylab, numpy theta = numpy.pi/4*numpy.arange(9,dtype=float) x = numpy.cos(theta) y = numpy.sin(theta) # The following line works #p = pylab.Polygon(zip(x,y)) # The following line causes a crash p = pylab.Polygon(numpy.vstack((x,y)).T) ax = pylab.subplot(111) ax.add_patch(p) pylab.show() Output: In [155]: run plot_polygon.py ------------------------------------------------------------------------ --- exceptions.TypeError Traceback (most recent call last) /Users/nvf/Documents/S.M. Thesis/plot_polygon.py 10 11 ax = pylab.subplot(111) ---> 12 ax.add_patch(p) 13 pylab.show() 14 /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- packages/matplotlib/axes.py in add_patch(self, p) 899 p.get_transform(), p.get_verts()) 900 #for x,y in xys: print x,y --> 901 self.update_datalim(xys) 902 self.patches.append(p) 903 /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- packages/matplotlib/axes.py in update_datalim(self, xys) 913 # Otherwise, it will compute the bounds of it's current data 914 # and the data in xydata --> 915 self.dataLim.update(xys, -1) 916 917 TypeError: CXX : Error creating object of type N2Py5TupleE WARNING: Failure executing file: <plot_polygon.py> Instead of converting from crash to exception, though, would it be possible to make it accept an Nx2 array? Please at least cc me in any replies, as I am not subscribed to this list. Thanks, Nick
Nick, Thanks for the bug report. I have been making some changes to use numerix more consistently internally, and fixing this bug would be a step in that direction. I will take a look. Eric Nick Fotopoulos wrote: > Dear matplotlib-users, > > I'd like to report a bug in Polygon, which is crashing with an > unhelpful error message where an exception would be appropriate. The > problem occurs when you feed Polygon an Nx2 array instead of an N- > length list of 2-tuples. This is on my PPC OSX system, with > everything freshly checked out from SVN (should the matplotlib > version still be 0.87.4?). > > Versions: > In [152]: numpy.__version__ > Out[152]: '1.1.2881' > In [154]: matplotlib.__version__ > Out[154]: '0.87.4' > > > Code: > import pylab, numpy > > theta = numpy.pi/4*numpy.arange(9,dtype=float) > > x = numpy.cos(theta) > y = numpy.sin(theta) > > # The following line works > #p = pylab.Polygon(zip(x,y)) > > # The following line causes a crash > p = pylab.Polygon(numpy.vstack((x,y)).T) > > ax = pylab.subplot(111) > ax.add_patch(p) > pylab.show() > > > Output: > In [155]: run plot_polygon.py > ------------------------------------------------------------------------ > --- > exceptions.TypeError Traceback (most > recent call last) > > /Users/nvf/Documents/S.M. Thesis/plot_polygon.py > 10 > 11 ax = pylab.subplot(111) > ---> 12 ax.add_patch(p) > 13 pylab.show() 14 > > /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- > packages/matplotlib/axes.py in add_patch(self, p) > 899 p.get_transform(), p.get_verts()) > 900 #for x,y in xys: print x,y > --> 901 self.update_datalim(xys) > 902 self.patches.append(p) > 903 > > /Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site- > packages/matplotlib/axes.py in update_datalim(self, xys) > 913 # Otherwise, it will compute the bounds of it's > current data > 914 # and the data in xydata > --> 915 self.dataLim.update(xys, -1) > 916 > 917 > > TypeError: CXX : Error creating object of type N2Py5TupleE > WARNING: Failure executing file: <plot_polygon.py> > > > Instead of converting from crash to exception, though, would it be > possible to make it accept an Nx2 array? > > Please at least cc me in any replies, as I am not subscribed to this > list. > > Thanks, > Nick > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys -- and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Matplotlib-users mailing list > Mat...@li... > https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Nick, svn 2635 has a fix for this bug. Eric Nick Fotopoulos wrote: > Dear matplotlib-users, > > I'd like to report a bug in Polygon, which is crashing with an > unhelpful error message where an exception would be appropriate. The > problem occurs when you feed Polygon an Nx2 array instead of an N- > length list of 2-tuples. This is on my PPC OSX system, with > everything freshly checked out from SVN (should the matplotlib > version still be 0.87.4?). > > Versions: > In [152]: numpy.__version__ > Out[152]: '1.1.2881' > In [154]: matplotlib.__version__ > Out[154]: '0.87.4' > > > Code: > import pylab, numpy > > theta = numpy.pi/4*numpy.arange(9,dtype=float) > > x = numpy.cos(theta) > y = numpy.sin(theta) > > # The following line works > #p = pylab.Polygon(zip(x,y)) > > # The following line causes a crash > p = pylab.Polygon(numpy.vstack((x,y)).T) > > ax = pylab.subplot(111) > ax.add_patch(p) > pylab.show()