Controlling the tracker when using twinx
matplotlib, python
Solution
Ah, found it: `ax.yaxis.set_ticks_position("right")`. Instead of trying to "control the tracker", you can swap the location of the y-axes.
ax1.yaxis.set_ticks_position("right")
ax2.yaxis.set_ticks_position("left")
ax1.plot(t, y2, 'g-', label='y1')
ax2.plot(t, y1, 'r-', label='y2')
AFAIK, the tracker always follows `ax2` when using `twinx`.
Problem
The tracker in the lower-right corner (highlighted in red) reports y-values relative to the y-axis on the right. How can I get the tracker to report y-values relative to the y-axis on the left instead? ``` import matplotlib.pyplot as plt import numpy as np np.random.seed(6) numdata = 100 t = np.linspace(0.05, 0.11, numdata) y1 = np.cumsum(np.random.random(numdata) - 0.5) * 40000 y2 = np.cumsum(np.random.random(numdata) - 0.5) * 0.002 fig = plt.figure() ax1 = fig.add_subplot(111) ax2 = ax1.twinx() ax1.plot(t, y1, 'r-', label='y1') ax2.plot(t, y2, 'g-', label='y2') ax1.legend() plt.show() ``` I know swapping `y1` with `y2` will make the tracker report y1-values, but this also places the `y1` tickmarks on the right-hand side, which is not what I want to happen. ``` ax1.plot(t, y2, 'g-', label='y2') ax2.plot(t, y1, 'r-', label='y1') ```