Python 在熊猫中使用索引绘制数据
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Use index in pandas to plot data
提问by paulchen
I have a pandas-Dataframe and use resample()to calculate means (e.g. daily or monthly means).
Here is a small example.
我有一个 pandas-Dataframe 并用于resample()计算平均值（例如每日或每月平均值）。这是一个小例子。
import pandas as pd
import numpy as np
dates = pd.date_range('1/1/2000', periods=100)
df = pd.DataFrame(np.random.randn(100, 1), index=dates, columns=['A'])
monthly_mean = df.resample('M', how='mean')
How do I plot the monthly_mean now?
How do I manage to use the index of my new created DataFrame monthly_meanas the x-axis?
Thanks in advance.
我现在如何绘制monthly_mean？我如何设法使用我新创建的 DataFrame 的索引monthly_mean作为 x 轴？提前致谢。
采纳答案by Marius
You can use reset_indexto turn the index back into a column:
您可以使用reset_index将索引转回列：
monthly_mean.reset_index().plot(x='index', y='A')
回答by Pablo Jadzinsky
Try this,
尝试这个，
monthly_mean.plot(y='A', use_index=True)
回答by Pablo Jadzinsky
Also,
还，
monthly_mean.plot(x=df.index, y='A')
monthly_mean.plot(x=df.index, y='A')
