Python How to increase reduce the fontsize of x and y tick labels

Question

I seem to have a problem in figuring out how to increase or decrease the fontsize of both the x and y tick labels while using matplotlib   I am aware that there is the set xticklabels labels  fontdict None  minor False    kwargs  function  but I failed to understand how to control the fontsize in it    I expected something somehow explicit  like   title string   My Title   plt suptitle title string  y 1 0  fontsize 17    but I haven t found anything like that so far  What am I missing

User · Accepted Answer

You can set the fontsize directly in the call to set_xticklabels and set_yticklabels (as noted in previous answers). This will only affect one Axes at a time.

ax.set_xticklabels(x_ticks, rotation=0, fontsize=8)
ax.set_yticklabels(y_ticks, rotation=0, fontsize=8)

You can also set the ticklabel font size globally (i.e. for all figures/subplots in a script) using rcParams:

import matplotlib.pyplot as plt

plt.rc('xtick',labelsize=8)
plt.rc('ytick',labelsize=8)

Or, equivalently:

plt.rcParams['xtick.labelsize']=8
plt.rcParams['ytick.labelsize']=8

Finally, if this is a setting that you would like to be set for all your matplotlib plots, you could also set these two rcParams in your matplotlibrc file:

xtick.labelsize      : 8 # fontsize of the x tick labels
ytick.labelsize      : 8 # fontsize of the y tick labels

User · Answer

It is simpler than I thought it would be   To set the font size of the x-axis ticks   x ticks   x tick 1   x tick 2   x tick 3   ax set xticklabels x ticks  rotation 0  fontsize 8    To do it for the y-axis ticks   y ticks   y tick 1   y tick 2   y tick 3   ax set yticklabels y ticks  rotation 0  fontsize 8    The arguments rotation and fontsize can easily control what I was after   Reference  http   matplotlib org api axes api html

User · Answer

One shouldn t use set yticklabels to change the fontsize  since this will also set the labels  i e  it will replace any automatic formatter by a FixedFormatter   which is usually undesired  The easiest is to set the respective tick params   ax tick params axis  x   labelsize 8  ax tick params axis  y   labelsize 20    or  ax tick params labelsize 8    in case both axes shall have the same size    Of course using the rcParams as in  tmdavison s answer is possible as well

User · Answer

Use the keyword size instead of fontsize

[python] Python: How to increase/reduce the fontsize of x and y tick labels?

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