在python中绘制Matplotlib直方图 [英] Ploting Matplotlib Histogram in python

问题描述

当我尝试在python中绘制直方图时遇到错误. 您能帮我解决这个错误吗? 我认为这不是一个大问题，但是我可以找到解决方案. :(

I faced an error when I tried to plot histogram in python. Could you please help me to solve this error? I think it is not a big issue, but I can find the solution yet. :(

代码

import matplotlib.pyplot as plt
import csv
import sys

def analyze():
#   datafile = 'test.csv'
    datafile = sys.argv[1]
    pieces = []
    with open(datafile, 'rt') as f:
        data = csv.reader(f,delimiter = '\t')
        for d in data:
            pieces.append(d)

    x = [op for op, response, interval in pieces]
    y1 = [interval for op, response, interval in pieces]


    plt.figure()
    plt.hist(y1)
    plt.show()

if __name__ == '__main__':
    analyze()

错误消息:

 File "./scripts/plot_histo.py", line 27, in <module>
    analyze()
  File "./scripts/plot_histo.py", line 23, in analyze
    plt.hist(y1)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/matplotlib/pyplot.py", line 2958, in hist
    stacked=stacked, data=data, **kwargs)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/matplotlib/__init__.py", line 1812, in inner
    return func(ax, *args, **kwargs)
  File "/usr/local/anaconda2/lib/python2.7/site-packages/matplotlib/axes/_axes.py", line 5995, in hist
    if len(xi) > 0:
TypeError: len() of unsized object

数据文件格式:

653070                232.93               104981.00
653071                277.94               104981.00
653072                232.93                12695.00
653073                232.93                25878.00
653074                232.93                32714.00
653075                232.93                19532.00
653076                232.93                19532.00
653077                232.93                32715.00
653078                232.93                32715.00
653079                232.93                45899.00
653080                232.93                65430.00
653081                232.93                65430.00
Continued .......
 ..........

推荐答案

尝试调试代码.您会发现y1是字符串列表，因此plt.hist(y1)会引发

Try to debug your code. You will find y1 is a list of strings, so plt.hist(y1) will raise

TypeError: len() of unsized object

当将操作或函数应用于对象时引发TypeError 类型不正确.

TypeError raised when an operation or function is applied to an object of inappropriate type.

这意味着您应该使用float或int，因此请尝试运行此代码:

That means you should use float or int, so try to run this:

y1 = [float(interval) for op, response, interval in pieces]

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