使用matplotlib创建100%堆积面积图 [英] Create a 100 % stacked area chart with matplotlib
问题描述
我想知道如何在matplotlib中创建100%的堆积面积图.在matplotlib页面上,我找不到它的示例.
I was wondering how to create a 100 % stacked area chart in matplotlib. At the matplotlib page I couldn't find an example for it.
这里有人可以告诉我如何实现这一目标?
Somebody here can show me how to achieve that?
推荐答案
一种简单的方法是确保每个x值的y值总和为100.
A simple way to achieve this is to make sure that for every x-value, the y-values sum to 100.
我假设您将y值组织在一个数组中,如下例所示,即
I assume that you have the y-values organized in an array as in the example below, i.e.
y = np.array([[17, 19, 5, 16, 22, 20, 9, 31, 39, 8],
[46, 18, 37, 27, 29, 6, 5, 23, 22, 5],
[15, 46, 33, 36, 11, 13, 39, 17, 49, 17]])
要确保列总数为100,必须将y
数组除以其列总和,然后乘以100.这将使y值跨度为0到100,使y轴 percent .相反,如果您希望y轴的值跨越从0到1的间隔,请不要乘以100.
To make sure the column totals are 100, you have to divide the y
array by its column sums, and then multiply by 100. This makes the y-values span from 0 to 100, making the "unit" of the y-axis percent. If you instead want the values of the y-axis to span the interval from 0 to 1, don't multiply by 100.
即使您没有像上面那样在 one 数组中组织y值,其原理也是相同的.每个数组中由y值组成的相应元素(例如y1
,y2
等)的总和应为100(或1).
Even if you don't have the y-values organized in one array as above, the principle is the same; the corresponding elements in each array consisting of y-values (e.g. y1
, y2
etc.) should sum to 100 (or 1).
下面的代码是示例 @LogicalKnight在其评论中链接的修改版本.
The below code is a modified version of the example @LogicalKnight linked to in his comment.
import numpy as np
from matplotlib import pyplot as plt
fnx = lambda : np.random.randint(5, 50, 10)
y = np.row_stack((fnx(), fnx(), fnx()))
x = np.arange(10)
# Make new array consisting of fractions of column-totals,
# using .astype(float) to avoid integer division
percent = y / y.sum(axis=0).astype(float) * 100
fig = plt.figure()
ax = fig.add_subplot(111)
ax.stackplot(x, percent)
ax.set_title('100 % stacked area chart')
ax.set_ylabel('Percent (%)')
ax.margins(0, 0) # Set margins to avoid "whitespace"
plt.show()
这给出了如下所示的输出.
This gives the output shown below.
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