Mathematical expressions with LaTeX in Matplotlib - Step-by-Step Execution

Concept Flow - Mathematical expressions with LaTeX

Write LaTeX string

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Pass string to matplotlib

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matplotlib parses LaTeX

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Render expression on plot

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Display plot with math

This flow shows how a LaTeX string is given to matplotlib, parsed, and rendered as a math expression on a plot.

Execution Sample

Matplotlib

import matplotlib.pyplot as plt
plt.title(r'$E=mc^2$')
plt.plot([1,2,3], [1,4,9])
plt.show()

This code plots points and shows the title with the LaTeX math expression E=mc^2.

Execution Table

Step	Action	Input/Code	Result
1	Import matplotlib.pyplot	import matplotlib.pyplot as plt	plt module ready
2	Set plot title with LaTeX	plt.title(r'$E=mc^2$')	Title set with math expression rendered
3	Plot points	plt.plot([1,2,3], [1,4,9])	Line plot created
4	Show plot	plt.show()	Plot window opens with title showing E=mc^2
5	Exit	Plot displayed	Execution ends

💡 Plot displayed and program ends

Variable Tracker

Variable	Start	After plt.title	After plt.plot	After plt.show
plt	module imported	title set with LaTeX string	plot data stored	plot displayed

Key Moments - 2 Insights

Why do we put an r before the string in plt.title(r'$E=mc^2$')?

The r means raw string so backslashes in LaTeX are not treated as escape characters. See execution_table step 2 where the LaTeX string is passed.

How does matplotlib know to render the string as math?

Because the string is enclosed in dollar signs $...$, matplotlib parses it as LaTeX math. This happens in step 2.

Visual Quiz - 3 Questions

Look at the execution table step 2, what does plt.title(r'$E=mc^2$') do?

A Plots the points on the graph

B Imports matplotlib module

C Sets the plot title with a LaTeX math expression

D Displays the plot window

💡 Hint

Check the 'Action' and 'Result' columns in step 2 of execution_table

At which step does the plot window open showing the math expression?

A Step 3

B Step 4

C Step 1

D Step 5

💡 Hint

Look at the 'Action' column for when plt.show() is called

If we remove the dollar signs from the string in plt.title, what happens?

A The title shows the raw string without math formatting

B The plot will not display

C An error occurs

D The plot points disappear

💡 Hint

Dollar signs tell matplotlib to parse LaTeX math, see key_moments about math rendering

Concept Snapshot

Use r'...' to write raw LaTeX strings in matplotlib.
Enclose math expressions in $...$ to render math.
Pass the string to plt.title(), plt.xlabel(), etc.
Call plt.show() to display the plot with math.
This lets you add clear math notation to your graphs.

Full Transcript

This lesson shows how to add mathematical expressions to matplotlib plots using LaTeX syntax. First, you write the math expression as a raw string with r'...'. Then, you enclose the math in dollar signs $...$ so matplotlib knows to parse it as math. You pass this string to functions like plt.title() to set the plot title. When you call plt.show(), the plot window opens and displays the graph with the math expression rendered clearly. This method helps you label plots with professional math notation easily.