# isinf

Check for Infinity entries.

## Syntax

* tf = isinf(M)

## Input argument

* M - a variable

## Output argument

* tf - logical: result of 'isinf'.

## Description

**isnan** returns a logical array which is true where elements of M are Infinity values.

## Example

```matlab
isnan(pi)
isinf(Inf)
isinf(-Inf)
isinf(int32(3))
X = sparse([1 2 NaN 3 0 Inf 0 4]);
R = isinf(X)
```

## See also

[isnan](isnan).

## History

| Version | Description     |
| ------- | --------------- |
| 1.0.0   | initial version |

## Author

Allan CORNET
