MATLAB Programming Fundamentals - MathWorks

Combine Categorical Arrays

This example shows how to combine two categorical arrays.

Create Categorical Arrays

Create a categorical array, A, containing the preferred lunchtime beverage of 25 students

in classroom A.

A = gallery('integerdata',3,[25,1],1);

A = categorical(A,1:3,{'milk' 'water' 'juice'});

A is a 25-by-1 categorical array with three distinct categories: milk, water, and juice.

Summarize the categorical array, A.

summary(A)

milk 8

water 8

juice 9

Eight students in classroom A prefer milk, eight prefer water, and nine prefer juice.

Create another categorical array, B, containing the preferences of 28 students in

classroom B.

B = gallery('integerdata',3,[28,1],3);

B = categorical(B,1:3,{'milk' 'water' 'juice'});

B is a 28-by-1 categorical array containing the same categories as A.

Summarize the categorical array, B.

summary(B)

milk 12

water 10

juice 6

Twelve students in classroom B prefer milk, ten prefer water, and six prefer juice.

Concatenate Categorical Arrays

Concatenate the data from classrooms A and B into a single categorical array, Group1.

Combine Categorical Arrays