问题
I have been using the matplotlib function plt.hist to generate histogram data from an array of values mV. This has worked fine in the past, but ever since I've updated my version of anaconda it throws back a ValueError:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/users/benjatin/HomeData/Code/buildSkyMap.py in <module>()
72 #get histogram of efficiencies
73 plt.figure()
---> 74 a=plt.hist(mV,bins=50)
75 plt.close()
76
/opt/apps/lsst/feb14/Linux64/anaconda/2.1.0/lib/python2.7/site-packages/matplotlib/pyplot.pyc in hist(x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, hold, **kwargs)
2888 histtype=histtype, align=align, orientation=orientation,
2889 rwidth=rwidth, log=log, color=color, label=label,
-> 2890 stacked=stacked, **kwargs)
2891 draw_if_interactive()
2892 finally:
/opt/apps/lsst/feb14/Linux64/anaconda/2.1.0/lib/python2.7/site-packages/matplotlib/axes/_axes.pyc in hist(self, x, bins, range, normed, weights, cumulative, bottom, histtype, align, orientation, rwidth, log, color, label, stacked, **kwargs)
5634 # this will automatically overwrite bins,
5635 # so that each histogram uses the same bins
-> 5636 m, bins = np.histogram(x[i], bins, weights=w[i], **hist_kwargs)
5637 m = m.astype(float) # causes problems later if it's an int
5638 if mlast is None:
/opt/apps/lsst/feb14/Linux64/anaconda/2.1.0/lib/python2.7/site-packages/numpy/lib/function_base.pyc in histogram(a, bins, range, normed, weights, density)
598 n.imag += np.bincount(indices, weights=tmp_w.imag, minlength=bins)
599 else:
--> 600 n += np.bincount(indices, weights=tmp_w, minlength=bins).astype(ntype)
601
602 # We now compute the bin edges since these are returned
ValueError: The first argument of bincount must be non-negative
None of the values in mV are negative, as was the problem here:
In [34]: mV[mV < 0]
Out[34]: array([], dtype=float64)
The update I did was:
conda: 3.7.0-py27_0 --> 4.0.5-py27_0 (soft-link)
openssl: 1.0.1h-1 --> 1.0.2h-0 (soft-link)
python: 2.7.8-1 --> 2.7.11-0 (soft-link)
pyyaml: 3.11-py27_0 --> 3.11-py27_1 (soft-link)
requests: 2.4.1-py27_0 --> 2.9.1-py27_0 (soft-link)
sqlite: 3.8.4.1-0 --> 3.9.2-0 (soft-link)
tk: 8.5.15-0 --> 8.5.18-0 (soft-link)
yaml: 0.1.4-0 --> 0.1.6-0 (soft-link)
zlib: 1.2.7-0 --> 1.2.8-0 (soft-link)
Thanks in advance for any help solving this issue.
回答1:
Filter out any nan and inf from your data before plotting the histogram. See the bug report here.
来源：https://stackoverflow.com/questions/37119818/numpy-histogram-fails-after-updating-anaconda