matplotlib fill_between 引发“输入类型不支持 ufunc 'isfinite' ”的错误？

Question

我想使用 matplotlib 填补 plot 中两行之间的空白，但它总是显示如下错误消息。 我已经检查过论坛中发布了类似的问题，但他们的解决方案不能解决这个问题。

import numpy as np
import pandas as pd
import openpyxl, os
import matplotlib.pyplot as plt

#read and convert data from an excel file to two dimensional numpy.array
df = pd.read_excel("Water.xlsx").values

#x axis is year, from 1900 to 2017
year = np.arange(1900,2018,1)

#read data from df and convert them to one-dimensional numpy.array 
W_low = df[:,[29]].ravel()
W_high = df[:,[30]].ravel()

#plot the two lines and fill in the gap 
fig, ax1 = plt.subplots(1, 1, sharex=True)
#no errors are raised until this line
ax1.fill_between (year, W_low, W_high)

错误信息

  File "C:\Users\Christina\.spyder-py3\temp.py", line 24, in <module>
    ax1.fill_between (year, W_low, W_high)

  File "C:\Users\Christina\anaconda3\lib\site-packages\matplotlib\__init__.py", line 1599, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)

  File "C:\Users\Christina\anaconda3\lib\site-packages\matplotlib\axes\_axes.py", line 5233, in fill_between
    y1 = ma.masked_invalid(self.convert_yunits(y1))

  File "C:\Users\Christina\anaconda3\lib\site-packages\numpy\ma\core.py", line 2377, in masked_invalid
    condition = ~(np.isfinite(a))

TypeError: ufunc 'isfinite' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

Answer 1

我自己解决了这个问题。 看来我之前使用的数据集不够干净。 我将整个数据集复制粘贴到一个新的 excel 工作表中，然后运行相同的脚本，然后它就可以完美运行了。

希望我的解决方案能帮助遇到同样问题的其他人。