/home/travis/build/matplotlib/matplotlib/doc/examples/images_contours_and_fields/streamplot_demo_start_points.rst:8: WARNING: Exception occurred in plotting streamplot_demo_start_points
 from /home/travis/build/matplotlib/matplotlib/doc/mpl_examples/images_contours_and_fields/streamplot_demo_start_points.py:
Traceback (most recent call last):
  File "/home/travis/build/matplotlib/matplotlib/venv/lib/python2.7/site-packages/matplotlib-1.5.0rc2+71.gb3290d4-py2.7-linux-x86_64.egg/matplotlib/sphinxext/plot_directive.py", line 517, in run_code
    six.exec_(code, ns)
  File "/home/travis/build/matplotlib/matplotlib/venv/lib/python2.7/site-packages/matplotlib-1.5.0rc2+71.gb3290d4-py2.7-linux-x86_64.egg/matplotlib/externals/six.py", line 672, in exec_
    exec("""exec _code_ in _globs_, _locs_""")
  File "<string>", line 1, in <module>
  File "<string>", line 24, in <module>
  File "/home/travis/build/matplotlib/matplotlib/venv/lib/python2.7/site-packages/matplotlib-1.5.0rc2+71.gb3290d4-py2.7-linux-x86_64.egg/matplotlib/__init__.py", line 1807, in inner
    return func(ax, *args, **kwargs)
  File "/home/travis/build/matplotlib/matplotlib/venv/lib/python2.7/site-packages/matplotlib-1.5.0rc2+71.gb3290d4-py2.7-linux-x86_64.egg/matplotlib/axes/_axes.py", line 4465, in streamplot
    zorder=zorder)
  File "/home/travis/build/matplotlib/matplotlib/venv/lib/python2.7/site-packages/matplotlib-1.5.0rc2+71.gb3290d4-py2.7-linux-x86_64.egg/matplotlib/streamplot.py", line 140, in streamplot
    sp2[:, 0] += np.abs(x[0])
TypeError: Cannot cast ufunc add output from dtype('float64') to dtype('int64') with casting rule 'same_kind'