MATLAB Function Reference |

Detect infinite elements of an array

**Syntax**

**Description**

```
TF = isinf(A)
```

returns an array the same size as `A`

containing logical true (`1`

) where the elements of `A`

are `+Inf`

or `-Inf`

and logical false (`0`

) where they are not.

For any A, exactly one of the three quantities `isfinite(A)`

, `isinf(A)`

, and `isnan(A)`

is equal to one.

**Examples**

a = [-2 -1 0 1 2] isinf(1./a) Warning: Divide by zero. ans = 0 0 1 0 0 isinf(0./a) Warning: Divide by zero. ans = 0 0 0 0 0

**See Also**

ishold | isjava |