All, This is due to the fact that you have nothing to plot and the axes range defaults to 0->1. Unfortunately 0 cannot map to a valid datetime. I thought that I had fixed this so that using datetimes would cause the axes to initialize to a valid datetime value. Once I get up to speed with the whole 'git' thing and figure out how to make submissions again, etc.
A quick work-around is to manually set the bounds for our datetime axis and turn off autoscaling until you have some data to display. I can probably take another look at it, but I am pretty busy and learning the git model of doing things is only slowing things down. :( --James > -----Original Message----- > From: Benjamin Root [mailto:ben.r...@ou.edu] > Sent: Friday, March 25, 2011 6:34 AM > To: Gerrit Kuhlmann > Cc: matplotlib-devel@lists.sourceforge.net > Subject: Re: [matplotlib-devel] Bug: plot numpy.nans vs. datetime objects > > On Friday, March 25, 2011, Gerrit Kuhlmann > <gerrit.kuhlm...@student.cityu.edu.hk> wrote: > > On Fri, 2011-03-25 at 01:08 -0700, Paul Ivanov wrote: > >> Gerrit Kuhlmann, on 2011-03-25 14:26, wrote: > >> > Hi all, > >> > > >> > I get a ValueError, if I try to plot a list of numpy.nans against > >> > datetime objects. I'm using Python 2.6.5 and Matplotlib 1.0.1 on > >> > Ubuntu Linux 10.04. Code and traceback are below. > >> > > >> > Best regards, > >> > Gerrit > >> > > >> > > >> > > >> > Code > >> > """" > >> > import matplotlib.pyplot as plt > >> > import numpy as np > >> > from datetime import datetime as DateTime > >> > > >> > t = [DateTime(2011,1,day) for day in xrange(1,20)] x = [np.nan for > >> > i in xrange(1,20)] > >> > > >> > plt.plot(t,x) > >> > plt.show() > >> > >> Hi Gerrit, > >> > >> Thanks for the report, though I'm not sure what you expect to happen > >> here? > >> > >> Changing at least one of the elements of x to be something other than > >> nan does not cause the error. > >> > >> There is an inconsistency, though, in that plt.plot(x,x) when x is > >> full of nans does not cause any errors. > >> > >> best, > > > > Hi Paul, > > > > thanks for your answer. I would expect similar behaviour as for > > "plot([0,1,2], [nan,nan,nan])", which creates an empty plot. A passed > > through exceptions from the datetime module seems a bit odd. > > > > Regards, > > Gerrit > > > > Agreed, I just came across this yesterday while working on my general exam > project. I have no clue why the behavior would be different because we are > using datetime objects. > > Ben Root > > > > > > ---------------------------------------------------------------------- > > -------- Enable your software for Intel(R) Active Management > > Technology to meet the growing manageability and security demands of > > your customers. Businesses are taking advantage of Intel(R) vPro (TM) > > technology - will your software be a part of the solution? Download > > the Intel(R) Manageability Checker today! > > http://p.sf.net/sfu/intel-dev2devmar > > _______________________________________________ > > Matplotlib-devel mailing list > > Matplotlib-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel > > > > ---------------------------------------------------------------------------- -- > Enable your software for Intel(R) Active Management Technology to meet > the growing manageability and security demands of your customers. > Businesses are taking advantage of Intel(R) vPro (TM) technology - will your > software be a part of the solution? Download the Intel(R) Manageability > Checker today! http://p.sf.net/sfu/intel-dev2devmar > _______________________________________________ > Matplotlib-devel mailing list > Matplotlib-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/matplotlib-devel ------------------------------------------------------------------------------ Enable your software for Intel(R) Active Management Technology to meet the growing manageability and security demands of your customers. Businesses are taking advantage of Intel(R) vPro (TM) technology - will your software be a part of the solution? Download the Intel(R) Manageability Checker today! http://p.sf.net/sfu/intel-dev2devmar _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
