How to Create a Pie Chart in MATLAB: Simple Guide

To create a pie chart in MATLAB, use the pie(data) function where data is a vector of values. This function draws a circular chart divided into slices proportional to the values in data.

Syntax

The basic syntax to create a pie chart in MATLAB is:

• pie(data): Creates a pie chart where data is a vector of numeric values.
• pie(data, labels): Adds labels to each slice, where labels is a cell array of strings.
• pie(data, explode): Highlights slices by pulling them out, where explode is a vector of 0s and 1s.

matlab

pie(data)
pie(data, labels)
pie(data, explode)

Example

This example shows how to create a simple pie chart with labels and one slice exploded for emphasis.

matlab

data = [30 15 45 10];
labels = {'Apples', 'Bananas', 'Cherries', 'Dates'};
explode = [0 1 0 0];
pie(data, explode, labels);

Output

A pie chart window opens showing four slices labeled Apples, Bananas, Cherries, and Dates. The Bananas slice is pulled out slightly from the circle.

Common Pitfalls

Common mistakes when creating pie charts in MATLAB include:

• Using non-numeric or empty data vectors, which causes errors.
• Mismatch between the number of labels and data values, leading to missing or extra labels.
• Using explode vectors with values other than 0 or 1, which MATLAB ignores or causes unexpected behavior.

Always ensure your data vector and labels have the same length and contain valid values.

matlab

wrong_data = [10 'a' 20]; % Invalid mixed data types
labels = {'A', 'B', 'C'};
pie(wrong_data, labels); % This will cause an error

% Correct way:
correct_data = [10 20 30];
pie(correct_data, labels);

Quick Reference

Function	Description
pie(data)	Create pie chart from numeric vector data
pie(data, labels)	Add labels to each slice
pie(data, explode)	Pull out slices where explode=1
pie(data, explode, labels)	Combine explode and labels

Key Takeaways

Use the pie(data) function with a numeric vector to create a pie chart.

Labels must be a cell array matching the length of data for proper display.

Explode vector uses 1 to pull out slices and 0 to keep them in place.

Ensure data contains only numeric values to avoid errors.

Check that labels and explode vectors match data length exactly.