## ISINF Test for infinities

Section: Inspection Functions

### Usage

Returns true for entries of an array that are infs (i.e., infinities). The usage isy = isinf(x)

The result is a logical array of the same size as `x`

,
which is true if `x`

is not-a-number, and false otherwise.
Note that for `complex`

or `dcomplex`

data types that
the result is true if either the real or imaginary parts
are infinite.

### Example

Suppose we have an array of floats with one element that is`inf`

:
--> a = [1.2 3.4 inf 5] a = 1.2000 3.4000 Inf 5.0000 --> isinf(a) ans = 0 0 1 0 --> b = 3./[2 5 0 3 1] b = 1.5000 0.6000 Inf 1.0000 3.0000