绘制Dataframe列 - datetime [英] Plotting Dataframe column - datetime

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本文介绍了绘制Dataframe列 - datetime的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我有一个日期时间列,时间相当随机,格式为:

  time 
-08 11:29:30
2016-07-08 11:30:02

现在我把它转换成datetime:

  df ['time2'] = pd.to_datetime(df ['time'])

然后我想使用matplotlib绘制,但不起作用:

  plt.plot(df。['time'],df ['y'])
pre>

我尝试将其转换为int,但是在绘制


$ b时,我无法弄明白如何格式化$ b

  df ['time_int'] = df ['time2']。astype(np.int64)

任何帮助都会很棒!

解决方案

我想你可以使用< a href =http://pandas.pydata.org/pandas-docs/stable/generated/pandas.Series.plot.html =nofollow noreferrer> Series.plot ,所以第一个



另一个解决方案是:

 code> df ['time'] = pd.to_datetime(df.time)
df.plot(x ='time',y ='y')
plt.show()


I have a datetime column with pretty random increments of time, format is:

time
2016-07-08 11:29:30
2016-07-08 11:30:02

Now I convert it to datetime:

df['time2'] = pd.to_datetime(df['time'])

Then I want to plot it using matplotlib, but it doesn't work:

plt.plot(df.['time'],df['y'])

I've tried converting it to an int, but then I can't figure out how to format it when plotting

 df['time_int'] = df['time2'].astype(np.int64)

Any help would be awesome!

解决方案

I think you can use Series.plot, so first set_index from column time:

import pandas as pd
import matplotlib.pyplot as plt

df = pd.DataFrame({'y': {0: 1, 1: 2, 2: 4}, 
                   'time': {0: '2016-07-08 11:29:30', 1: '2016-07-08 11:30:02', 2: '2016-07-08 11:31:52'}})

print (df)
                  time  y
0  2016-07-08 11:29:30  1
1  2016-07-08 11:30:02  2
2  2016-07-08 11:31:52  4

df['time'] = pd.to_datetime(df.time)

print (df.set_index('time').y)
time
2016-07-08 11:29:30    1
2016-07-08 11:30:02    2
2016-07-08 11:31:52    4
Name: y, dtype: int64

df.set_index('time').y.plot()
plt.show()

Another solution is:

df['time'] = pd.to_datetime(df.time)
df.plot(x='time', y='y')
plt.show()

这篇关于绘制Dataframe列 - datetime的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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