Question

我想知道在matplotlib中绘制条形图时出错。我试图制作一个条形图。它使用year_avg和yerr。

year_avg
1992    34484.080607
1993    39975.673587
1994    37565.689950
1995    47798.504333
name: year_avg, dtype: float64

yerr
1992    4883.203514   
1993    2873.929360   
1994    3904.568221   
1995    1779.298157  
name: yerr, dtype: float64 

import pandas as pd
import numpy as np
bars = plt.bar(range(df.shape[0]), year_avg, color = 'blue', yerr = yerr)
plt.show()

给出以下错误。我想知道如何解决错误。

KeyError                                  Traceback (most recent call last)
<ipython-input-39-2962d639bd49> in <module>()
      1 #plt.figure()
----> 2 bars = plt.bar(range(df.shape[0]), year_avg, color = 'lightslategrey', yerr = yerr).values
      3 plt.show()

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\matplotlib\pyplot.pyc in bar(left, height, width, bottom, hold, data, **kwargs)
   2641     try:
   2642         ret = ax.bar(left, height, width=width, bottom=bottom, data=data,
-> 2643                      **kwargs)
   2644     finally:
   2645         ax.hold(washold)

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\matplotlib\__init__.pyc in inner(ax, *args, **kwargs)
   1809                     warnings.warn(msg % (label_namer, func.__name__),
   1810                                   RuntimeWarning, stacklevel=2)
-> 1811             return func(ax, *args, **kwargs)
   1812         pre_doc = inner.__doc__
   1813         if pre_doc is None:

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\matplotlib\axes\_axes.pyc in bar(self, left, height, width, bottom, **kwargs)
   2154             errorbar = self.errorbar(x, y,
   2155                                      yerr=yerr, xerr=xerr,
-> 2156                                      fmt='none', **error_kw)
   2157         else:
   2158             errorbar = None

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\matplotlib\__init__.pyc in inner(ax, *args, **kwargs)
   1809                     warnings.warn(msg % (label_namer, func.__name__),
   1810                                   RuntimeWarning, stacklevel=2)
-> 1811             return func(ax, *args, **kwargs)
   1812         pre_doc = inner.__doc__
   1813         if pre_doc is None:

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\matplotlib\axes\_axes.pyc in errorbar(self, x, y, yerr, xerr, fmt, ecolor, elinewidth, capsize, barsabove, lolims, uplims, xlolims, xuplims, errorevery, capthick, **kwargs)
   2961                 # Check for scalar or symmetric, as in xerr.
   2962                 if len(yerr) > 1 and not ((len(yerr) == len(y) and not (
-> 2963                         iterable(yerr[0]) and len(yerr[0]) > 1))):
   2964                     raise ValueError("yerr must be a scalar, the same "
   2965                                      "dimensions as y, or 2xN.")

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\pandas\core\series.pyc in __getitem__(self, key)
    558     def __getitem__(self, key):
    559         try:
--> 560             result = self.index.get_value(self, key)
    561 
    562             if not lib.isscalar(result):

C:\Users\Anaconda2\envs\gl-env\lib\site-packages\pandas\indexes\base.pyc in get_value(self, series, key)
   1909         try:
   1910             return self._engine.get_value(s, k,
-> 1911                                           tz=getattr(series.dtype, 'tz', None))
   1912         except KeyError as e1:
   1913             if len(self) > 0 and self.inferred_type in ['integer', 'boolean']:

pandas\index.pyx in pandas.index.IndexEngine.get_value (pandas\index.c:3234)()

pandas\index.pyx in pandas.index.IndexEngine.get_value (pandas\index.c:2931)()

pandas\index.pyx in pandas.index.IndexEngine.get_loc (pandas\index.c:3891)()

pandas\hashtable.pyx in pandas.hashtable.Int64HashTable.get_item (pandas\hashtable.c:6527)()

pandas\hashtable.pyx in pandas.hashtable.Int64HashTable.get_item (pandas\hashtable.c:6465)()

KeyError: 0L

绘制条形图的错误

0 个答案: