Tompa - 1 year ago 69

Python Question

Consider the following python code for plotting a matplotlib figure:

`import matplotlib.pylab as pp`

import numpy as np

alpha = np.linspace(0, 2 * np.pi, 400)

sig1 = np.sin(alpha)

sig2 = np.sin(2 * alpha) + 2 * (alpha > np.pi)

ax1 = pp.subplot(111)

ax2 = ax1.twinx()

ax1.plot(alpha, sig1, color='b')

ax2.plot(alpha, sig2, color='r')

ax1.set_ylabel('sig1 value', color='b')

ax2.set_ylabel('sig2 value', color='r')

pp.grid()

pp.show()

Giving me a nice plot

I would like to find out how to disable one of the axes for panning / zooming, so when I use the pan / zoom tool, only ax2 will rescale for example. Is there a way to do this? I want to do it programmatically.

Answer Source

You can do this using `ax2.set_navigate(False)`

:

```
from matplotlib.pyplot import *
import numpy as np
fig,ax1 = subplots(1,1)
ax2 = ax1.twinx()
ax2.set_navigate(False)
x = np.linspace(0,2*np.pi,100)
ax1.plot(x,np.sin(x),'b')
ax1.set_xlabel('Scaleable axis')
ax1.set_ylabel('Scaleable axis')
ax2.plot(x,np.sin(x+1),'r')
ax2.set_ylabel('Static axis',weight='bold')
```