> I am a matplotlib.pyplot novice, but I have looked through various FAQs to no > avail. > > I am plotting a polar graph with some negative values of r. Everything goes > well until I try to use rgrids(). Am I doing something wrong? > > I attach some demo scripts and their outputs. > > version1.py uses rgrid() but only has positive values of r. Everything works > the way I expect it to (see version1.png). > > version2.py has negative values of r and the same call to rgrid() and > misbehaves (see version2.png). > > version3.py is the same as version2.py, but without the call to rgrids() (but > with negative values of r). Again everything is as expected. > > What am I doing wrong in version2.py?
and only because it (sadly) took me a few minutes to figure out (even though it seemed so obvious), to create the plot of your version 3, with only positively defined values for "r", you can do t = numpy.linspace(0,2*numpy.pi,61) r = t t2 = numpy.linspace(-numpy.pi,numpy.pi,61) r2 = numpy.pi - t2 plt.polar(t,r) plt.polar(t2,r2) andre ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
