[Matplotlib-users] Problem creating legend for scatter plot with NANs

[burak1000 <bur...@gm...>]

Hi all,

I believe I've found a bug in scatter function in matplotlib 1.4.2:


from numpy import *
import matplotlib
from matplotlib.pyplot import *

figure()
subplot(111)
h = scatter([NAN], [NAN], marker="o", facecolor="r", edgecolor="r", s=3)

legend([h], ["scatter"])

savefig("out.png")

close()


The code above fails with ValueError exception:

Traceback (most recent call last):
  File "legend.py", line 9, in <module>
    legend([h], ["scatter"])
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/pyplot.py",
line 3381, in legend
    ret = gca().legend(*args, **kwargs)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/axes.py",
line 4778, in legend
    self.legend_ = mlegend.Legend(self, handles, labels, **kwargs)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/legend.py",
line 366, in __init__
    self._init_legend_box(handles, labels)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/legend.py",
line 630, in _init_legend_box
    handlebox)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/legend_handler.py",
line 103, in __call__
    handlebox.get_transform())
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/legend_handler.py",
line 325, in create_artists
    width, height, fontsize)
  File
"/usr/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-linux-x86_64.egg/matplotlib/legend_handler.py",
line 282, in get_sizes
    size_max = max(orig_handle.get_sizes()) * legend.markerscale ** 2
ValueError: max() arg is an empty sequence


There is some more information and the source of the problem described here:

http://stackoverflow.com/questions/29743696/legends-for-scatter-plots-with-nans-in-matplotlib

Thanks,
Tomasz




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