How to set the range of minor ticks?

Question

I'm working on a bar plot. The picture I've plot as following:

To add the arrows in top and bottom axis, I set the spines color as 'none' first.

Then I plot arrow by using axes.arrow() function.

Finally, I reset the ticks by using axes.set_ticks() function.

I want to keep the minor ticks of top axis. But as what you've seen, the minor ticks in the left top corner is out of the arrow's range. How can I delete the part out of range?

Answer 1

The minor ticks can be set via set_minor_locator using a FixedLocator.

An example:

from matplotlib import pyplot as plt
from matplotlib.ticker import FixedLocator

fig, ax = plt.subplots()
ax.set_xscale('log')
ax.set_xlim(10**6, 1)
ax.set_xticks([10**n for n in range(-1, 5)])
ax.xaxis.set_minor_locator(FixedLocator(
    [k * 10**n for n in range(-1, 5) for k in range(2, 10) if k * 10**n <= 30000]))
ax.xaxis.tick_top()
plt.show()