matplotlib酒吧不对称误差条

Question

我需要绘制条形图不对称误差棒...

的matplotlib.pyplot.bar函数的文档说：

Detail: xerr and yerr are passed directly to errorbar(), so they can also have shape 2xN for independent specification of lower and upper errors.

但是，我可以不给一个2×N个排列到yerr ...

import numpy as np 
import matplotlib.pyplot as plt 

plt.bar(xrange(5), [2,5,3,4,7], yerr=[[1,4,2,3,6],[4,10,6,8,14]]) #DO NOT work! 

并告诉我下面的错误：

Traceback (most recent call last): 
    File "bar_stacked.py", line 9, in <module> 
    plt.bar(xrange(5), [2,5,3,4,7], yerr=[[1,4,2,3,6],[4,10,6,8,14]]) 
    File "/usr/lib/pymodules/python2.7/matplotlib/pyplot.py", line 1742, in bar 
    ret = ax.bar(left, height, width, bottom, color, edgecolor, linewidth, yerr, xerr, ecolor, capsize, align, orientation, log, **kwargs) 
    File "/usr/lib/pymodules/python2.7/matplotlib/axes.py", line 4253, in bar 
    "incompatible sizes: bar() argument 'yerr' must be len(%s) or scalar" % nbars) 
ValueError: incompatible sizes: bar() argument 'yerr' must be len(5) or scalar 

但是，不是此函数：

import numpy as np 
import matplotlib.pyplot as plt 

plt.errorbar(xrange(5), [2,5,3,4,7], yerr=[[1,4,2,3,6],[4,10,6,8,14]]) 

工作正常。

matplotlib.pyplot.bar不再支持yerr的2xN数组吗？ 如果答案是肯定的......我如何绘制一个带有不对称误差线的条形图？

谢谢你的时间！

Answer 1

您正在使用哪个版本的matplotlib？

随着1.1.1（最新版本）的版本，您的代码完美无瑕。