`logical`

Converts values to logical true or false.

Category: Language Fundamentals > Operators and Elementary Operations

Syntax

L = logical(A)

Returns an array of true where A is nonzero and false where it is zero.

Description

Any nonzero value, positive or negative, becomes true, so logical([2 0 -1]) is [1 0 1]. The logical class occupies one byte per element and is what comparisons return. It is required for logical indexing: only true/false arrays select elements as a mask, while a numeric array of zeros and ones is read as subscripts.

NaN has no truth value and raises an error.

Input arguments

A: Numeric or logical array, or char. Must not contain NaN.

Output arguments

L: Logical array of the same size as A.

Example

m = logical([2 0 -1])
x = [10 20 30];
x(m)
x(logical([0 1 1]))
class(m)

Output

m = 1×3 logical array

   1   0   1
ans = 1×2

    10    30
ans = 1×2

    20    30
ans = 'logical'

logical