[matplotlib-devel] Bug in stepfilled hist with log y

[Jeff K. <kl...@wi...>]

When creating a histogram with histtype='stepfilled' and log=True, the
fill always ends up getting cut off diagonally.  It looks like it's
connection one datapoint with 10^-100 on the other side of the plot.
So, also, it looks like it's always choosing 10^-100 as an arbitrary
lower limit, which is another problem.

Is this a known bug?  Does anybody have ideas for an intelligent way
to handle stepfilled log histograms?

A working example is below, with the output plot attached.

Thanks,
Jeff

|| Jeff Klukas, Research Assistant, Physics
|| University of Wisconsin -- Madison
|| jeff.klukas@gmail | jeffyklukas@aim | jeffklukas@skype
|| http://www.hep.wisc.edu/~jklukas/

---------------------------------------------
#!/usr/bin/env python
import numpy as np
import matplotlib.mlab as mlab
import matplotlib.pyplot as plt

mu, sigma = 100, 15
x = mu + sigma*np.random.randn(10000)

# the histogram of the data
n, bins, patches = plt.hist(x, 50, normed=1, facecolor='green', alpha=0.75,
                            log=True, histtype='stepfilled')

plt.xlabel('Smarts')
plt.ylabel('Probability')
plt.title(r'$\mathrm{Histogram\ of\ IQ:}\ \mu=100,\ \sigma=15$')
plt.axis([40, 160, 0, 0.03])
plt.grid(True)

plt.show()
---------------------------------------------