# Documentation

### This is machine translation

Translated by
Mouseover text to see original. Click the button below to return to the English verison of the page.

To view all translated materals including this page, select Japan from the country navigator on the bottom of this page.

# isinf

Array elements that are infinite

TF = isinf(A)

## Description

TF = isinf(A) returns an array the same size as A containing logical 1 (true) where the elements of A are +Inf or -Inf and logical 0 (false) where they are not. For a complex number z, isinf(z) returns 1 if either the real or imaginary part of z is infinite, and 0 if both the real and imaginary parts are finite or NaN.

For any real A, exactly one of the three quantities isfinite(A), isinf(A), and isnan(A) is equal to one.

## Examples

collapse all

Determine the infinite elements of the row vector, A.

A = 1./[-2 -1 0 1 2]
A =

-0.5000   -1.0000       Inf    1.0000    0.5000

TF = isinf(A)
TF = 1x5 logical array
0   0   1   0   0