`isfinite`

Marks elements that are neither infinite nor NaN.

Category: Language Fundamentals > Data Types

Syntax

tf = isfinite(A)

Returns a logical array that is true where the element is a finite number.

Description

An element is finite when it is not Inf, -Inf or NaN. For a complex number both the real and imaginary parts must be finite. Integer types are always finite, so the result is all true.

isfinite(A) is equivalent to ~isinf(A) & ~isnan(A).

Input arguments

A: Numeric, logical or char array, or a datetime or duration array.

Output arguments

tf: Logical array the same size as A.

Example

Filtering out bad values

x = [1 Inf -Inf NaN 4];
isfinite(x)
x(isfinite(x))

Output

ans = 1×5 logical array

   1   0   0   0   1
ans = 1×2

     1     4

isfinite