Asked By – ymmx
I’m trying to share two subplots axes, but I need to share the x axis after the figure was created. E.g. I create this figure:
import numpy as np import matplotlib.pyplot as plt t = np.arange(1000)/100. x = np.sin(2*np.pi*10*t) y = np.cos(2*np.pi*10*t) fig = plt.figure() ax1 = plt.subplot(211) plt.plot(t,x) ax2 = plt.subplot(212) plt.plot(t,y) # some code to share both x axes plt.show()
Instead of the comment I want to insert some code to share both x axes.
How do I do this? There are some relevant sounding attributes
_shared_x_axes when I check to figure axis (
fig.get_axes()) but I don’t know how to link them.
Now we will see solution for issue: How to share x axes of two subplots after they have been created
The usual way to share axes is to create the shared properties at creation. Either
fig=plt.figure() ax1 = plt.subplot(211) ax2 = plt.subplot(212, sharex = ax1)
fig, (ax1, ax2) = plt.subplots(nrows=2, sharex=True)
Sharing the axes after they have been created should therefore not be necessary.
However if for any reason, you need to share axes after they have been created (actually, using a different library which creates some subplots, like here might be a reason), there would still be a solution:
creates a link between the two axes,
ax2. In contrast to the sharing at creation time, you will have to set the xticklabels off manually for one of the axes (in case that is wanted).
A complete example:
import numpy as np import matplotlib.pyplot as plt t= np.arange(1000)/100. x = np.sin(2*np.pi*10*t) y = np.cos(2*np.pi*10*t) fig=plt.figure() ax1 = plt.subplot(211) ax2 = plt.subplot(212) ax1.plot(t,x) ax2.plot(t,y) ax1.get_shared_x_axes().join(ax1, ax2) ax1.set_xticklabels() # ax2.autoscale() ## call autoscale if needed plt.show()
The other answer has code for dealing with a list of axes:
This question is answered By – ImportanceOfBeingErnest
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