Michael Hannon wrote: > Greetings. I need to make some histograms from within a Python program, > and I noticed that Matplotlib, which I've never used before, appears to > have that capability. > > At: > http://matplotlib.sourceforge.net/ > > I see the following simple example: > > >>> from pylab import randn, hist > >>> x = randn(10000) > >>> hist(x, 100) > > And there is a more-extended example at: > > http://matplotlib.sourceforge.net/_static/plot_directive/mpl_examples/pylab_examples/histogram_demo.py > > Unfortunately, when I run either example I get nothing but complaints > and errors, as in the appended. > > This is on a system running 64-bit Fedora 9 and Python 2.5.1. > > I'm evidently doing something wrong. Will somebody please point me in > the right direction?
It sounds like your matplotlib version is too old for your numpy version. What version of matplotlib are you using? Can you install a newer one, or, better yet, build from svn? (The warning from numpy is easy to deal with; the TypeError from matplotlib is what indicates that the version is incompatible.) Eric > > Thanks. > > - Mike > > > $ python > Python 2.5.1 (r251:54863, Jun 15 2008, 18:24:56) > [GCC 4.3.0 20080428 (Red Hat 4.3.0-8)] on linux2 > Type "help", "copyright", "credits" or "license" for more information. >>>> from pylab import randn, hist >>>> x = randn(10000) >>>> hist(x, 100) > /usr/lib64/python2.5/site-packages/numpy/lib/function_base.py:343: > Warning: > The semantics of histogram has been modified in > the current release to fix long-standing issues with > outliers handling. The main changes concern > 1. the definition of the bin edges, > now including the rightmost edge, and > 2. the handling of upper outliers, now ignored rather > than tallied in the rightmost bin. > The previous behaviour is still accessible using > `new=False`, but is scheduled to be deprecated in the > next release (1.3). > > *This warning will not printed in the 1.3 release.* > > Use `new=True` to bypass this warning. > > Please read the docstring for more information. > > """, Warning) > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > File "/usr/lib64/python2.5/site-packages/matplotlib/pyplot.py", line > 1633, in hist > ret = gca().hist(*args, **kwargs) > File "/usr/lib64/python2.5/site-packages/matplotlib/axes.py", line > 5117, in hist > n, bins = npy.histogram(x, bins, range=None, normed=normed) > TypeError: 'NoneType' object is not iterable > > ------------------------------------------------------------------------- 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-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
