多轴单图例 [英] Single legend for multiple axes

问题描述

我有以下示例代码:

fig1.suptitle('Test')
ax1 = fig1.add_subplot(221)
ax1.plot(x,y1,color='b',label='aVal')
ax2 = ax1.twinx()
ax2.plot(x,y2,color='g',label='bVal')
ax2.grid( ls='--', color='black')
legend([ax1,ax2], loc=2)

该子图在同一子图上有两个比例不同的轴，并且我只希望两个轴都有一个图例.我尝试了上面的代码，它不起作用，仅从ax2中产生细节.有什么想法吗?

The subplot has two axes with different scales on the same subplot and I want only one legend for both axes. I tried the above code and it does not work and only produces details from ax2. Any ideas?

推荐答案

我认为它是可行的解决方案！有没有比这更好的方法了?

I figured it a solution that works! Is there a better way than this?

fig1.suptitle('Test')
ax1 = fig1.add_subplot(221)
ax1.plot(x,y1,color='b',label='aVal')
ax2 = ax1.twinx()
ax2.plot(x,y2,color='g',label='bVal')
ax2.grid( ls='--', color='black')
h1, l1 = ax1.get_legend_handles_labels()
h2, l2 = ax2.get_legend_handles_labels()
ax1.legend(h1+h2, l1+l2, loc=2)

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