How to Add Title to Subplots in Matplotlib?

Introduction:

In this tutorial we are learning about how to Add Title to Subplots in Matplotlib. Matplotlib is a widely used Python package for creating plots, subplots, and visualizations with names and descriptions. When creating multiple subimages, it can be helpful to give each subimage a name to provide more context and clarity to users and viewers.

Matplotlib:

Matplotlib is a library designed for the Python programming language and NumPy, its numerical extension. Tkinter, wxPython, Qt, and GTK GUI tools will include graphics using their object-oriented APIs. It is a collection of command-style that make matplotlib work like MATLAB. Every pyplot function has its functionality, whether it adds new areas, draws lines, adds labels, etc. It changes the graph in some way. (Note that the term "axes" throughout this document refers to the axis portion of the chart, not the mathematical term used for multiple axes).

Subplots:

Subplots in Matplotlib allow multiple plots or plots to be displayed in a single plot. Subplots allow us to compare and analyze multiple pieces of data at once. This makes it easier to see or identify patterns, trends, and relationships. A subplot is a grid of smaller graphs that are part of a larger graph. Each subplot has a position in the grid is based on the grid's number of rows and columns and the subplot's position in the grid. Matplotlib's "subplot" method allows us to create a subplot. This function returns the properties of the plot and subplot. We can use this subplot object to plot the data in each subplot.

Title of the plot:

The title() method in the Matplotlib module is used to specify a title for the plot and specify the name of various objects.

A few steps are needed to Add Title to Subplots in Matplotlib, which are given as follows -

Firstly, we need to import all libraries.
Then, create or load the data.
After that, we make the subplot.
Then we plot this subplot.
Lastly, set the title to subplots.

Syntax:

The syntax for Add Title to Subplots in Matplotlib is given below -

Parameters:

The parameters for Add Title to Subplots in Matplotlib are given below -

nrows: The nrows parameter is used to specify the rows number of subplots in the grid.
ncolumns: The ncolumns parameter is used to specify the number of columns in the grid's subplot.
index: The index parameter is used to specify the index of the current subplot. It starts at 1 and then increases line by line.

There are various methods to Add Title to Subplots in Matplotlib, which are -

Method 1: Using the set_title() method

Program Code:

Here we give a program code to Add Title to Subplots in Matplotlib by using the set_title() method. We use the matplotlib.axes._axes.Axes.set_title(label) method for setting the title (string label) of the current subplot axis. The code is given below -

# Here, we import all the packages
import numpy as n
import matplotlib.pyplot as p
 
# Here, we create the data
b = n.array([1, 2, 3, 4, 5, 6, 7, 8])
 
# Here we are making the subplots
fig, a = p.subplots(2, 2)
 
# Here, we set the data with subplots and plot
a[0, 0].plot(b, b)
a[0, 1].plot(b, b*2)
a[1, 0].plot(b, b*b)
a[1, 1].plot(b, b*b*b)
 
# Here, we set the title of the subplots
a[0, 0].set_title("Linear Plot")
a[1, 1].set_title("Cube Plot")
a[0, 1].set_title("Double Plot")
a[1, 0].set_title("Square Plot")

 
# Here, we set the spacing
fig.tight_layout()
p.show()

Output:

Now, we run the above code and find the subplot with the given title. The output is

How to Add Title to Subplots in Matplotlib?

given below -

Method 2: Using the title.set_text() method

Program Code:

Here, we give a program code to Add Titles to Subplots in Matplotlib by using the title.set_text() method. We can also use the title.set_text() method, similar to the set_title() method, to add a new title to the subplot in Matplotlib. The code is given below -

# Here, we import all the packages
import numpy as n
import matplotlib.pyplot as p
 
# Here, we create the data
b = n.array([1, 2, 3, 4, 5, 6, 7, 8])
 
# Here we are making the subplots
fig, a = p.subplots(2, 2)
 
# Here, we set the data with subplots and plot
a[0, 0].plot(b, b)
a[0, 1].plot(b, b*2)
a[1, 0].plot(b, b*b)
a[1, 1].plot(b, b*b*b)
 
# Here we set the title of the subplots
a[0, 0].title.set_text("Linear Plot")
a[1, 1].title.set_text("Cube Plot")
a[0, 1].title.set_text("Double Plot")
a[1, 0].title.set_text("Square Plot")
 
 
# Here, we set the spacing
fig.tight_layout()
p.show()

Output:

Now, we run the above code and find the subplot with the given title. The output is given below -

Method 3: Using the plt.gca().set_title() method

Program Code:

Here, we give a program code to Add Titles to Subplots in Matplotlib by using the plt.gca().set_title() method. If you use a Matlab-like style in the interactive plot, you can use the plt.gca() command to get a reference to the current axis of the subplot and assign it with the set_title( ) method to set the name of the subplot in Matplotlib. The code is given below -

# Here, we import all the packages
import numpy as n
import matplotlib.pyplot as p
 
# Here, we create the data
b = n.array([1, 2, 3, 4, 5, 6, 7, 8])
 
# Here we are making the subplots
fig, a = p.subplots(2, 2)
 
# Here, we set the data with subplots and plot
plot_title = ["Linear Plot", "Double Plot", "Square Plot", "Cube Plot"]
x = [b, b*2, b*b, b*b*b]
 
for i in range(4):
      
   # Here, make the subplots
   p.subplot(2, 2, i+1) 
    
   # Here we plotting (x,y)
   p.plot(b, x[i]) 
    
   # Here, we set the title of the subplots
   p.gca().set_title(plot_title[i]) 
 
# Here, we set the spacing
fig.tight_layout()
p.show()

Output:

Now, we run the above code and find the subplot with the given title. The output is given below -

Method 4: Using the plt.gca().title.set_text() method

Program Code:

Here we give a program code to Add Title to Subplots in Matplotlib by using the plt.gca().title.set_text() method. If you are using the Matlab-like style in interactive plotting, you can use plt.gca() to reference the current axis of the subplot and assign it to the title.set_text() method to set the title of the subplot in Matplotlib. The code is given below -

# Here, we import all the packages
import numpy as n
import matplotlib.pyplot as p
 
# Here, we create the data
b = n.array([1, 2, 3, 4, 5, 6, 7, 8])
 
# Here we are making the subplots
fig, a = p.subplots(2, 2)
 
# Here, we set the data with subplots and plot
plot_title = ["Linear Plot", "Double Plot", "Square Plot", "Cube Plot"]
x = [b, b*2, b*b, b*b*b]
 
for i in range(4):
      
   # Here, make the subplots
   p.subplot(2, 2, i+1) 
    
   # Here we plotting (x,y)
   p.plot(b, x[i]) 
    
   # Here, we set the title of the subplots
   p.gca().title.set_text(plot_title[i]) 
 
# Here, we set the spacing
fig.tight_layout()
p.show()

Output:

Now, we run the above code and find the subplot with the given title. The output is given below -

Conclusion:

So, in this tutorial we are learning to add a title to Subplots in Matplotlib. In summary, adding the title to subplots in Matplotlib helps provide more clarity and details to the viewer by adding the title of the subplots where we use four methods or functions provided in the matplotlib library. You can easily add a title to the subplots in Matplotlib using Python by following the steps outlined in this tutorial.

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