MATLAB Programming Fundamentals - MathWorks

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Create Categorical Array from String Array

Starting in R2016b, you can create string arrays with the string function and convert
them to categorical array.

Create a string array that contains names of planets.

str = string({'Earth','Jupiter','Neptune','Jupiter','Mars','Earth'})

str = 1x6 string array
"Earth" "Jupiter" "Neptune" "Jupiter" "Mars" "Earth"

Convert str to a categorical array.

planets = categorical(str)

planets = 1x6 categorical array
Earth Jupiter Neptune Jupiter Mars Earth

Add missing elements to str and convert it to a categorical array. Where str has missing
values, planets has undefined values.

str(8) = 'Mars'

str = 1x8 string array
Columns 1 through 6

"Earth" "Jupiter" "Neptune" "Jupiter" "Mars" "Earth"

Columns 7 through 8

Create Categorical Arrays