即使在 matplotlib 中的 plt.cla() 之后，如何强制 xlim 永久不变

Question

I want to force the xlim unchanged permanently, even after plt.cla() in matplotlib with Jupyter Notebook.

data=[[0,1],[0,1]]
plt.ylim(0,4)
plt.plot(*data)
plt.cla()

data=[[0,2],[0,2]]
plt.plot(*data) # <- rescaled automatically...

How to solve?

Answer 1

plt.cla() clears the axes and all the information about limits stored in it. Options you have:

• Store the previous values and reset them to the new axes.

   import matplotlib.pyplot as plt data=[[0,1],[0,1]] plt.ylim(0,4) plt.plot(*data) xlims = plt.xlim() plt.cla() data=[[0,2],[0,2]] plt.plot(*data) plt.xlim(xlims) plt.show()

• Don't clear the axes. Instead maybe just remove the content from the axes.

   import matplotlib.pyplot as plt data=[[0,1],[0,1]] plt.ylim(0,4) plt.plot(*data) for line in plt.gca().lines: line.remove() data=[[0,2],[0,2]] plt.plot(*data) plt.show()