向绘图添加右Yticks

Question

我试着做一个排序的图，这是我的代码和输出：

ticks = [3500, 5000]
labels = ["\u0332P", "P\u0305"]


plt.title("Nilai Premi Optimal \n dengan Batasan")
plt.xlabel("$\it{Bargaining Power}$ \u03BB")

plt.plot(xlamda, PsiBLamda, color = "red",linestyle='dashed',label = "$\u03C8_{B} (I^*(X))$")
plt.plot(xlamda, PsiSLamda, color = "blue",linestyle='dashed', label = "$\u03C8_{S} (I^*(X))$")
plt.legend(loc="upper left")
plt.plot(xlamda, PLamda, color = "black")
plt.xlim([0, 1])
plt.ylim([3500, 7000])

plt.show()

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绘图输出是正确的，但是我想在右y轴的5000点处添加一个记号，标签为P。下面是一个示例：

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我该如何编码呢？谢谢

Answer 1

查看secondary axes

ticks = [3500, 5000]
labels = ["\u0332P", "P\u0305"]


fig, ax = plt.subplots() # need the axis object

plt.title("Nilai Premi Optimal \n dengan Batasan")
plt.xlabel("$\it{Bargaining Power}$ \u03BB")

plt.plot(xlamda, PsiBLamda, color = "red",linestyle='dashed',label = "$\u03C8_{B} (I^*(X))$")
plt.plot(xlamda, PsiSLamda, color = "blue",linestyle='dashed', label = "$\u03C8_{S} (I^*(X))$")
plt.legend(loc="upper left")
plt.plot(xlamda, PLamda, color = "black")
plt.xlim([0, 1])
plt.ylim([3500, 7000])

rightax = ax.secondary_yaxis('right') # create secondary axis on the right
rightax.set_yticks(ticks) # set tick locations
rightax.set_yticklabels(labels) # set tick labels

plt.show()