Correct KeyError from matplotlib when processing Series xerr/yerr

Author: gliptak

doc/source/whatsnew/v0.18.2.txt

@@ -30,7 +30,7 @@ Other enhancements
 ^^^^^^^^^^^^^^^^^^
 
 - The ``.tz_localize()`` method of ``DatetimeIndex`` and ``Timestamp`` has gained the ``errors`` keyword, so you can potentially coerce nonexistent timestamps to ``NaT``. The default behaviour remains to raising a ``NonExistentTimeError`` (:issue:`13057`)
-
+- Correct ``KeyError`` from matplotlib when processing ``Series`` ``xerr``/``yerr`` (:issue:`13114`)
 
 
 

pandas/tools/plotting.py

@@ -1331,6 +1331,10 @@ def _plot(cls, ax, x, y, style=None, is_errorbar=False, **kwds):
             x = x._mpl_repr()
 
         if is_errorbar:
+            if 'xerr' in kwds:
+                kwds['xerr'] = np.array(kwds.get('xerr'))
+            if 'yerr' in kwds:
+                kwds['yerr'] = np.array(kwds.get('yerr'))
             return ax.errorbar(x, y, **kwds)
         else:
             # prevent style kwarg from going to errorbar, where it is

pandas/tseries/tests/test_plotting.py

@@ -76,6 +76,13 @@ def test_frame_inferred(self):
         df = DataFrame(np.random.randn(len(idx), 3), index=idx)
         _check_plot_works(df.plot)
 
+    def test_is_error_nozeroindex(self):
+        # GH11858
+        i = np.array([1, 2, 3])
+        a = DataFrame(i, index=i)
+        _check_plot_works(a.plot, xerr=a)
+        _check_plot_works(a.plot, yerr=a)
+
     def test_nonnumeric_exclude(self):
         import matplotlib.pyplot as plt