分组多个值,并绘制结果 [英] groupby multiple values, and plotting results

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问题描述

我正在使用一些关于杀菌剂使用情况的数据,其中包括年份,杀菌剂,使用量,以及熊猫DataFrame中的一些不相关的列。它看起来有点像:

I'm using some data on fungicide usage which has the Year, Fungicide, Amount used, along with some irrelevant columns in a panda DataFrame. It looks somewhat like:

Year, State,      Fungicide, Value
2011, California, A,         12879
2011, California, B,         29572
2011, Florida,    A,         8645
2011, Florida,    B,         19573
2009, California, A,         8764
2009, California, B,         98643,
...

我想从中得到一张总计随着时间的推移使用杀真菌剂,绘制每种杀真菌剂的线(以不同的颜色)。我已经使用.groupby来获得每年使用的每种杀真菌剂的总量:

What I want from it is a single plot of total fungicide used over time, with a line plotted for each individual fungicide (in a different colour). I've used .groupby to get the total amount of each fungicide used each year:

apple_fplot = df.groupby(['Year','Fungicide'])['Value'].sum()

我想绘制的值,如:

This gives me the values I want to plot, something like:

Year, Fungicide, Value
...
2009, A,        128635
      B,        104765
2011, A,        154829
      B,        129865

现在我需要绘制它,以便每个杀真菌剂(A,B,...)在单个图上是一个单独的线 >

Now I need to plot it so that each fungicide (A, B, ...) is a separate line on a single plot of Value over Time

有没有办法做到这一点,而不是全部分离出来?原谅我的无知,我是python的新手,并且对它仍然很熟悉。

Is there a way of doing this without separating it all out? Forgive my ignorance, I'm new to python and am still getting familiar with it.

推荐答案

legend xticks ,你可以

For a clean solution that properly prints legend and xticks, you could

apple_fplot = df.groupby(['Year','Fungicide'])['Value'].sum()
plot_df = apple_fplot.unstack('Fungicide').loc[:, 'Value']
plot_df.index = pd.PeriodIndex(plot_df.index.tolist(), freq='A')
plot_df.plot()


对于 subplots ,只是将相应的关键字设置为 True

For subplots, just set the respective keyword to True:

plot_df.plot(subplots=True)

得到:

这篇关于分组多个值,并绘制结果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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