MATLAB Programming Fundamentals - MathWorks

Determine if Arrays Are Logical

To determine whether an array is logical, you can test the entire array or each element

individually. This is useful when you want to confirm the output data type of a function.

This page shows several ways to determine if an array is logical.

In this section...

“Identify Logical Matrix” on page 5-7

“Test an Entire Array” on page 5-8

“Test Each Array Element” on page 5-8

“Summary Table” on page 5-9

Identify Logical Matrix

Create a 3-by-6 matrix and locate all elements greater than 0.5.

A = gallery('uniformdata',[3,6],0) > 0.5

A =

1 0 0 0 1 0

0 1 0 1 1 1

1 1 1 1 0 1

The result, A, is a 3-by-6 logical matrix.

Use the whos function to confirm the size, byte count, and class (or data type) of the

matrix, A.

whos A

Name Size Bytes Class Attributes

A 3x6 18 logical

The result confirms that A is a 3-by-6 logical matrix.

Determine if Arrays Are Logical