在python中水平对齐条形图图例 [英] Horizontally align bar plot legends in python
问题描述
我已使用以下代码制作了多轴图，但无法按需要排列图例.我的图的代码如下:
I have made a multi axis graph using the following code and I am unable to arrange the legend as I want. The code of my graph is as follows:
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(4)
y = [5, 7, 4, 9]
z = [9, 3, 5, 6]
r = [30, 40, 45, 37]
fig,ax = plt.subplots()
abc = ax.bar(x,y,0.25 )
cde = ax.bar(x+0.25,z,0.25)
ax.legend((abc[0], cde[0]), ('y', 'z'),bbox_to_anchor=(0., 1.02, 1, .102) , borderaxespad=0.)
ax.set_xticks(x + 0.25 / 2)
ax.set_xticklabels(('A', 'B', 'C', 'D'))
ax2 = ax.twinx()
efg = ax2.plot(x+0.25/2,r,color = 'black',label = "r")
ax2.legend(bbox_to_anchor=(0.11,1.07) , borderaxespad=0.)
plt.show()
它显示的图形是这样的.
The graph it shows is like this.
右上角的图例垂直对齐，但我希望它们水平对齐.我找不到与此有关的任何文档.我希望它们如下图所示.
The legend on the top-right side are aligned vertically but I want them to be horizontally aligned. I couldn't find any documentation on this. I want them to be as shown in the following figure.
谢谢
推荐答案
You need to use the ncol argument, which sets the number of columns to use in the legend, e.g. ncol=2 would give you two columns.
ax.legend(..., ncol=2)
然后，您可以使用loc参数和bbox_to_anchor一起查看如何放置图例，找到合理的参数并使两个图例相互对齐:
You may then look at how to place the legend using the loc argument together with the bbox_to_anchor, to find sensible parameters and make both legends align to each other:
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(4)
y = [5, 7, 4, 9]
z = [9, 3, 5, 6]
r = [30, 40, 45, 37]
fig,ax = plt.subplots()
abc = ax.bar(x,y,0.25 )
cde = ax.bar(x+0.25,z,0.25)
ax.legend((abc[0], cde[0]), ('y', 'z'),loc="lower right", bbox_to_anchor=(1., 1.02) , borderaxespad=0., ncol=2)
ax.set_xticks(x + 0.25 / 2)
ax.set_xticklabels(('A', 'B', 'C', 'D'))
ax2 = ax.twinx()
efg = ax2.plot(x+0.25/2,r,color = 'black',label = "r")
ax2.legend(bbox_to_anchor=(0,1.02),loc="lower left", borderaxespad=0.)
plt.show()
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