I would like to have corresponding tick marks on both the left and right y-axes. However, I would like the left y-axis ticks to be outside the axes and the right y-axis ticks to be inside the axes.
What I have:
import matplotlib.pyplot as plt
ax = plt.subplot(1,1,1)
ax.tick_params(axis='y',which='both',direction='in',right=True)
Is there any way to get the ax.tick_params() to work only on the right axis?
Ticks are actually the same on both sides of the axes, so one cannot change them for only one side of the axes.
In addition to @Sheldore's answer, one would probably want to share the twin axes, else both sides come out of sync.
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.tick_params(axis="y", direction='in', length=8)
ax2 = ax.twinx()
ax2.tick_params(direction="out", right=True, length=8)
ax2.get_shared_y_axes().join(ax,ax2)
plt.show()
Matplotlib 3.1 introduced secondary axes. This is useful in many cases where previously one would have needed to misuse a twin axes, as above. The advantage is that without further arguments, it will be synchronized automatically.
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.tick_params(axis="y", direction='in', length=8)
ax2 = ax.secondary_yaxis("right")
ax2.tick_params(axis="y", direction="out", length=8)
plt.show()
The output is the same in both cases:
I think you need to define a twin axis in order to achieve this. Specifically, you can do
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.tick_params(axis='y', direction='out')
ax1 = ax.twinx()
ax1.tick_params(axis='y',direction='in')
