Eric Bruning wrote: > I raised this a week or so ago on mpl-users, and after some more > digging I thought I'd bring it over to mpl-dev. > > With the following snippet, I expect a vertical Line2D from y=(0, 2) > and a Collection of squares at y=(4, 5, 6) at the specified time. > > The actual result is a vertical line and no squares, even though the y > axis limits adjust to (0,7) as if something is being plotted with the > call to scatter. > > from pylab import * > from datetime import datetime > f=figure() > ax=f.add_subplot(111) > d=datetime(2004,05,26,23,00,00) > d=date2num(d) > ax.xaxis_date() > ln, = ax.plot((d,d,d),range(3)) # vertical line > sc = ax.scatter((d,d,d),(4,5,6),marker='s') # no symbols plotted > show() > > However, with ax.xaxis_date() just before show(), I see the Collection. > > What is the cause of this inconsistency? I was surprised by it, since > I naively assumed that once the axis property was set, future > additions to the axes would plot with the date axis in mind, as Line2D > seems to. I poked around a bit with the _transform, _transforms, and > _transOffset properties of the collections, but didn't get anywhere. > > I'll be using date axes heavily in an interactive MPL project, where > it would be nice to set the date axes once and forget about it. I'm > willing to work on a fix if the problem is more than a lack > understanding on my end. > > Thanks, > Eric
Eric, I think most of us on the development side are a bit confused about the "units" support that handles dates among other things. In particular, a few days ago I was checking scatter and found that it did not work with dates (at least not in the simplest example). I fixed one thing that looked like it might have been causing the trouble, but it still didn't work. John has promised to provide some guidance, and so I hope we soon can make units work everywhere they should, and make it clear from the docstrings when they can or can't be used. Eric ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
