Making Title Bold in Matplotlib

Matplotlib is a popular plotting library in Python that can be used to create a wide variety of visualizations. One common customization that users often want to make is to make the title of their plot bold. In this article, we will explore different ways to achieve this in Matplotlib.

Example 1: Using `fontweight` Parameter

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontweight='bold')
plt.show()

Output:

Example 2: Using `style` Parameter with “bold”

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', style='bold')
plt.show()

Example 3: Setting Font Properties

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontdict={'weight': 'bold'})
plt.show()

Output:

Example 4: Using `set_fontweight` Method

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.plot([1, 2, 3, 4], [1, 4, 9, 16])
ax.set_title('Bold Title Example')
ax.title.set_fontweight('bold')
plt.show()

Output:

Example 5: Using `weight` Parameter with `set_font_properties`

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.plot([1, 2, 3, 4], [1, 4, 9, 16])
ax.set_title('Bold Title Example')
ax.title.set_font_properties(weight='bold')
plt.show()

Example 6: Using `FontProperties` from `matplotlib.font_manager`

import matplotlib.pyplot as plt
from matplotlib.font_manager import FontProperties

fig, ax = plt.subplots()
ax.plot([1, 2, 3, 4], [1, 4, 9, 16])
ax.set_title('Bold Title Example', fontproperties=FontProperties(weight='bold'))
plt.show()

Output:

Example 7: Creating a Custom Font Dictionary

import matplotlib.pyplot as plt

custom_font = {'fontsize': 12, 'fontweight': 'bold'}
plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontdict=custom_font)
plt.show()

Output:

Example 8: Using `loc` Parameter to Position the Title

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontweight='bold', loc='right')
plt.show()

Output:

Example 9: Combining Font Properties

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.title('Bold Title Example', fontdict={'weight': 'bold', 'size': 16})
plt.show()

Output:

Example 10: Bold Subtitle with `suptitle`

import matplotlib.pyplot as plt

plt.plot([1, 2, 3, 4], [1, 4, 9, 16])
plt.suptitle('Bold Title Example', fontweight='bold')
plt.show()

Output:

Conclusion

In this article, we have explored different ways to make the title of a plot bold in Matplotlib. By using the fontweight parameter, style parameter, setting font properties, or utilizing the FontProperties from matplotlib.font_manager, you can easily customize the appearance of your plot titles. Experiment with these methods to achieve the desired visual effect in your Matplotlib plots.