How to Add a Title to a Graph in Matplotlib with Python 


               


How to Add a Title to a Graph in Matplotlib with Python



Python


In this article, we show how to add a title to a graph in matplotlib with Python.

So with matplotlib, the heart of it is to create a figure.

On this figure, you can populate it with all different types of data, including axes, a graph plot, a geometric shape, etc.

To this graph, you can add a title, which by default gets centered above the graph.

A title can be added to a graph with the set_title() function.

Inside of this set_title() function, you specify the name of the title that you want.

In the following code shown below, we create the title, "Time vs. Time Squared Graph Plot"



So the first thing we have to do is import matplotlib. We do this with the line, import matplotlib.pyplot as plt

We then create a variable fig, and set it equal to, plt.figure()

This creates a figure object, which of course is initially empty, because we haven't populated it with anything.

So we have a figure object stored in the variable, fig, that is empty.

We then add axes to this figure using the add_axes() function.

This add_axes() function takes in a list of values. The values from the left to right are the left, bottom, width, and height.

They are numbers that vary from 0 to 1 and represent the percentage of the blank figure that you want to go and take.

So for this figure in our code, we have the line, axes= fig.add_axes([0.1,0.1,0.8,0.8])

This adds axes to the figure.

Next, we add an x label for the horizontal axis and we add a y label for the vertical axis.

We add an x label for the horizontal axis with the set_xlabel() function. We set the x label to "Time" in the code.

We add a y label for the vertical axis with the set_ylabel() function. We set the y label to "Time Squared" in the code. >>> axes.set_title('Time vs Time Squared Graph Plot')

We then set the title using the set_title() function. We use the line, axes.set_title('Time vs Time Squared Graph Plot'), to set the title to "Time vs Time Squared Graph Plot". You will see this title centered over the graph.

To show this graph, we use the line, fig.show()

This works if you're using a python IDE other than jupyter notebooks. If you are using jupyter notebooks, then you would not use, plt.show(). Instead you would specify in the code right after importing matplotlib, %matplotlib inline

This line allows the figure of a graph to be shown with jupyter notebooks.

After running the following code above, we get the following graph shown in the image below.


Figure object with a title in matplotlib with Python


So now you see a graph with a title.

And this is how to add a title to a graph in matplotlib with Python.


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