Benjamin Root <ben.root-grryuj3d...@public.gmane.org> writes: >> However, it seems to me that this is quite a serious bug. The contour >> documentation on >> >> http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.contour >> does not mention this requirement, and obviously the contour method >> itself does not even bother to check if its arguments are monotonically >> increasing. Instead, it just *silently* produces garbage that in some >> cases even looks like plausible data(!). >> >> Am I missing something here? Otherwise I'll report this on the bug >> tracker. I think this should be documented and contour() should check >> its input and raise a ValueError if it's not monotonic. > > You are right, the documentation is seriously lacking and woefully > out-of-date. It still claims that it can not handle internal regions > correctly with masked arrays (I am pretty sure that is fixed) and it says > nothing of any characteristics of X and Y.
I see. I added this issue to the bug tracker so that it doesn't get forgotten. > I don't know if there are any strict requirement on monotonicity for X and > Y, or if there are any cases where the plot is still valid even if that > property is violated. If it is a requirement, then I agree that there > should be a check. How can it not be a requirement if the output is wrong in some cases? It does not matter if there are also cases where it works - you would never be able to trust any plot you generate. > P.S. - I find that in many cases, contourf() is the wrong function to use > for such plots, and find pcolor() (or one of its variants) to be better > suited. Don't know what is better for you in your case, but it might be > something to investigate. Thanks for the hint, looks interesting. I looked at the documentation, but I don't really understand the difference between pcolor and pcolormesh. Could you elaborate on that? Best, -Nikolaus -- »Time flies like an arrow, fruit flies like a Banana.« PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C ------------------------------------------------------------------------------ Nokia and AT&T present the 2010 Calling All Innovators-North America contest Create new apps & games for the Nokia N8 for consumers in U.S. and Canada $10 million total in prizes - $4M cash, 500 devices, nearly $6M in marketing Develop with Nokia Qt SDK, Web Runtime, or Java and Publish to Ovi Store http://p.sf.net/sfu/nokia-dev2dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
