How to Change the Font Size of All Elements in a Matplotlib Plot?

Customizing Font Size in Matplotlib Plots

In matplotlib, controlling the font size of plot elements is essential for presentability. One common task is to adjust the size of all elements, including ticks, labels, and the title. While changing tick label sizes is straightforward, the process for altering the remaining elements may not be as intuitive.

To achieve this, the matplotlib configuration mechanism can be employed. The rc() function allows setting parameters for different aspects of the plot. For instance, to change the font size for all elements, the following syntax can be used:

import matplotlib
font = {'family' : 'normal',
        'weight' : 'bold',
        'size'   : 22}

matplotlib.rc('font', **font)

In this code, we create a dictionary, font, which specifies the desired font properties. By passing this dictionary as a keyword argument to the rc() function, we effectively set the font for all elements in the plot.

An alternative approach involves using the rcParams update method:

matplotlib.rcParams.update({'font.size': 22})

This method allows setting a specific font size without defining a font dictionary. Additionally, it can be imported into the script using:

import matplotlib.pyplot as plt
plt.rcParams.update({'font.size': 22})

For further customization options, users can refer to the matplotlib documentation on Customizing matplotlib, which provides a comprehensive list of configurable font properties.

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