How do I set the figure title and axes labels font size in Matplotlib

Question

I am creating a figure in Matplotlib like this   from matplotlib import pyplot as plt  fig   plt figure   plt plot data  fig suptitle  test title   plt xlabel  xlabel   plt ylabel  ylabel   fig savefig  test jpg     I want to specify font sizes for the figure title and the axis labels  I need all three to be different font sizes  so setting a global font size  mpl rcParams  font size   x  is not what I want  How do I set font sizes for the figure title and the axis labels individually

User · Answer

Others have provided answers for how to change the title size, but as for the axes tick label size, you can also use the set_tick_params method.

E.g., to make the x-axis tick label size small:

ax.xaxis.set_tick_params(labelsize='small')

or, to make the y-axis tick label large:

ax.yaxis.set_tick_params(labelsize='large')

You can also enter the labelsize as a float, or any of the following string options: 'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large', or 'xx-large'.

User · Answer

An alternative solution to changing the font size is to change the padding  When Python saves your PNG  you can change the layout using the dialogue box that opens  The spacing between the axes  padding if you like can be altered at this stage

User · Answer

Per the official guide  use of pylab is no longer recommended  matplotlib pyplot should be used directly instead     Globally setting font sizes via rcParams should be done with   import matplotlib pyplot as plt plt rcParams  axes labelsize     16 plt rcParams  axes titlesize     16    or  params     axes labelsize   16             axes titlesize   16  plt rcParams update params     or  import matplotlib as mpl mpl rc  axes   labelsize 16  titlesize 16     or   axes     labelsize   16           titlesize   16  mpl rc  axes     axes    The defaults can be restored using  plt rcParams update plt rcParamsDefault    You can also do this by creating a style sheet in the stylelib directory under the matplotlib configuration directory  you can get your configuration directory from matplotlib get configdir     The style sheet format is  axes labelsize  16 axes titlesize  16   If you have a style sheet at  path to mpl configdir stylelib mystyle mplstyle then you can use it via   plt style use  mystyle      or  for a single section  with plt style context  mystyle                You can also create  or modify  a matplotlibrc file which shares the format  axes labelsize   16 axes titlesize   16   Depending on which matplotlibrc file you modify these changes will be used for only the current working directory  for all working directories which do not have a matplotlibrc file  or for all working directories which do not have a matplotlibrc file and where no other matplotlibrc file has been specified  See this section of the customizing matplotlib page for more details    A complete list of the rcParams keys can be retrieved via plt rcParams keys    but for adjusting font sizes you have  italics quoted from here    axes labelsize - Fontsize of the x and y labels axes titlesize - Fontsize of the axes title figure titlesize - Size of the figure title  Figure suptitle    xtick labelsize - Fontsize of the tick labels ytick labelsize - Fontsize of the tick labels legend fontsize - Fontsize for legends  plt legend    fig legend    legend title fontsize - Fontsize for legend titles  None sets to the same as the default axes  See this answer for usage example    all of which accept string sizes   xx-small    x-small    smaller    small    medium    large    larger    x-large    xxlarge   or a float in pt  The string sizes are defined relative to the default font size which is specified by   font size - the default font size for text  given in pts  10 pt is the standard value   Additionally  the weight can be specified  though only for the default it appears  by   font weight - The default weight of the font used by text Text  Accepts  100  200  300  400  500  600  700  800  900  or  normal   400    bold   700    lighter   and  bolder   relative with respect to current weight

User · Answer

If you re more used to using ax objects to do your plotting  you might find the ax xaxis label set size   easier to remember  or at least easier to find using tab in an ipython terminal  It seems to need a redraw operation after to see the effect  For example   import matplotlib pyplot as plt    set up a plot with dummy data fig  ax   plt subplots   x    0  1  2  y    0  3  9  ax plot x y     title and labels  setting initial sizes fig suptitle  test title   fontsize 12  ax set xlabel  xlabel   fontsize 10  ax set ylabel  ylabel   fontsize  medium       relative to plt rcParams  font size      setting label sizes after creation ax xaxis label set size 20  plt draw     I don t know of a similar way to set the suptitle size after it s created

User · Answer

7  best solution   from numpy import   import matplotlib pyplot as plt  X   linspace -pi  pi  1000   class Crtaj       def nacrtaj self x y            self x x          self y y          return plt plot  x y  quot om quot    def oznaci self       return plt xlabel  quot x-os quot    plt ylabel  quot y-os quot    plt grid b True   6  slightly worse solution  from numpy import  M   array   3 2 3   1 2 6    class AriSred object       def   init   self m       self m m      def srednja self       redovi   len M      stupci   len  M 0       lista        a 0     suma 0     while a lt stupci          for i in range  0 redovi               suma suma  M i a          lista append suma          a a 1         suma 0     b array lista       b b redovi     return b    OBJ   AriSred M  sr   OBJ srednja

User · Answer

To only modify the title s font  and not the font of the axis  I used this   import matplotlib pyplot as plt fig   plt Figure   ax   fig add subplot 111  ax set title  My Title   fontdict   fontsize   8   fontweight    medium      The fontdict accepts all kwargs from matplotlib text Text

User · Answer

You can also do this globally via a rcParams dictionary   import matplotlib pylab as pylab params     legend fontsize    x-large              figure figsize    15  5             axes labelsize    x-large             axes titlesize   x-large             xtick labelsize   x-large             ytick labelsize   x-large   pylab rcParams update params

User · Answer

Functions dealing with text like label  title  etc  accept parameters same as matplotlib text Text  For the font size you can use size fontsize   from matplotlib import pyplot as plt      fig   plt figure   plt plot data  fig suptitle  test title   fontsize 20  plt xlabel  xlabel   fontsize 18  plt ylabel  ylabel   fontsize 16  fig savefig  test jpg     For globally setting title and label sizes  mpl rcParams contains axes titlesize and axes labelsize   From the page    axes titlesize        large     fontsize of the axes title axes labelsize        medium    fontsize of the x any y labels    As far as I can see  there is no way to set x and y label sizes separately    And I see that axes titlesize does not affect suptitle  I guess  you need to set that manually

User · Answer

Place right ax before set ylabel    ax right ax set ylabel  AB scale

[python] How do I set the figure title and axes labels font size in Matplotlib?

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