Matplotlib 日志 plot,set_xlim

Question

In the code written below, I am trying to get the x tick labels by using the function get_xticks() after setting a limit to x axis values which is 1,2. So I was expecting values between 1 to 2 from get_xticks() . But instead I am getting set of values [0.1,1,10,100] .

I could not understand why it is giving these values. Is it because of loglog plot? If so how this limit is related to the the values that I am getting now?

time = [1, 2, 3, 4]
position = [10, 20, 30, 40]

plt.xlabel('Time (hr)')
plt.ylabel('Position (km)')
fig = plt.figure(1) 
ax = fig.add_subplot(111)
ax.loglog(time,position)
xlim = [1,2]
ax.set_xlim(xlim)
xlabels = ax.get_xticks()

Answer 1

Yes, it's because the plot is loglog. What you are seeing in the plot is actually one major tick (10^0) and the other 5 are minor ticks.

ax.get_xticks has an argument minor= which will return the minor ticks instead of the major ticks, if set to True

print(ax.get_xticks())  # returns the major ticks
# [  0.1   1.   10.  100. ]

print(ax.get_xticks(minor=True))  # returns the minor ticks
# [1.2000000000000002, 1.4000000000000001, 1.6, 1.8, 2.0]