pandas 从熊猫数据框中绘制累积图表？
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Draw a cumulative chart from a pandas dataframe?
提问by Richard
I have a dataframe as follows:
我有一个数据框如下：
df = pd.DataFrame({'cost_saving': [10, 10, 20, 40, 60, 60],
'id': ['a', 'b', 'c', 'd', 'e', 'f']})
How can I draw a cumulative chart of the savings?
如何绘制储蓄累积图表？
I'm thinking of a line chart with number of items on the x-axis, and total savings on the y-axis.
我正在考虑一个折线图，x 轴上有项目数，y 轴上有总储蓄。
The chart should show that the bulk of the savings come from a few items.
该图表应显示大部分节省来自少数项目。
I've tried:
我试过了：
dftest['cost_saving'].plot(drawstyle='steps')
but it doesn't plot the cumulative values.
但它没有绘制累积值。
Thanks for any help!
谢谢你的帮助！
回答by piRSquared
I did:
我做了：
df.set_index('id').cumsum()
And got:
并得到：
cost_saving
id
a 10
b 20
c 40
d 80
e 140
f 200
This:
这个：
df.reset_index().plot.line(df.cost_saving.cumsum(), 'index', drawstyle='steps')
Gets me:
得到我：
