Matplotlib：如何从列表中绘制数据，添加两个y轴？

Question

我需要制作一些matplotlib的情节，但我很擅长。我有五个lists，每个100包含line-and-marker个值。他们的价值取决于：

我希望能够从中生成两个list图表：

1. 第一个图包含列表1,2,3和4，并且两个y轴。列表1,2和3依赖于常规y轴，而列表4依赖于添加的y轴，如下所示：



1. 第二个必须只绘制List 4和5，但是使用常规的y轴。

在继续之前，我是否需要将每个numpy array转换为matplotlib？无论如何，我没有弄清楚如何使用{{1}}进行绘图。任何帮助都感激不尽。谢谢！

Answer 1

您只需制作twinx轴即可在单独的y轴上绘制list 4。您可以看到示例here。

这是一个简短的脚本，可以做你想做的事。在这种情况下，无需转换为numpy数组。

import matplotlib.pyplot as plt

# Some sample lists
l1 = [0.7,0.8,0.8,0.9,0.8,0.7,0.6,0.9,1.0,0.9]
l2 = [0.2,0.3,0.1,0.0,0.2,0.1,0.3,0.1,0.2,0.1]
l3 = [0.4,0.6,0.4,0.5,0.4,0.5,0.6,0.4,0.5,0.4]

l4 = [78,87,77,65,89,98,74,94,85,73]
l5 = [16,44,14,55,34,36,76,54,43,32]

# Make a figure
fig = plt.figure()

# Make room for legend at bottom
fig.subplots_adjust(bottom=0.2)

# The axes for your lists 1-3
ax1 = fig.add_subplot(211)
# A twin axis for list 4. This shares the x axis, but has a separate y axis
ax2 = ax1.twinx()

# Plot lines 1-3
line1 = ax1.plot(l1,'bo-',label='list 1')
line2 = ax1.plot(l2,'go-',label='list 2')
line3 = ax1.plot(l3,'ro-',label='list 3')

# Plot line 4
line4 = ax2.plot(l4,'yo-',label='list 4')

# Some sensible y limits
ax1.set_ylim(0,1)
ax2.set_ylim(0,100)

# Your second subplot, for lists 4&5
ax3 = fig.add_subplot(212)

# Plot lines 4&5
ax3.plot(l4,'yo-',label='list 4')
line5 = ax3.plot(l5,'mo-',label='list 5')

# To get lines 1-5 on the same legend, we need to 
# gather all the lines together before calling legend
lines = line1+line2+line3+line4+line5
labels = [l.get_label() for l in lines]

# giving loc a tuple in axes-coords. ncol=5 for 5 columns
ax3.legend(lines, labels, loc=(0,-0.4), ncol=5)

ax3.set_xlabel('events')

# Display the figure
plt.show()