MATLAB Programming Fundamentals - MathWorks

Plot Categorical Data

This example shows how to plot data from a categorical array.

Load Sample Data

Load sample data gathered from 100 patients.

load patients

whos

Name Size Bytes Class Attributes

Age 100x1 800 double

Diastolic 100x1 800 double

Gender 100x1 12212 cell

Height 100x1 800 double

LastName 100x1 12416 cell

Location 100x1 15008 cell

SelfAssessedHealthStatus 100x1 12340 cell

Smoker 100x1 100 logical

Systolic 100x1 800 double

Weight 100x1 800 double

Create Categorical Arrays from Cell Arrays of Character Vectors

The workspace variable, Location, is a cell array of character vectors that contains the

three unique medical facilities where patients were observed.

To access and compare data more easily, convert Location to a categorical array.

Location = categorical(Location);

Summarize the categorical array.

summary(Location)

County General Hospital 39

St. Mary's Medical Center 24

VA Hospital 37

39 patients were observed at County General Hospital, 24 at St. Mary's Medical Center,

and 37 at the VA Hospital.

8 Categorical Arrays