# nan

Abbreviation for Not A Number. If used as a built-in function returns an n x n or m x n matrix where each cell equals NaN.

## Syntax

R = nan

R = nan(n)

R = nan(m,n)

## Inputs

`n`- Any valid scalar | string | vector | matrix
`m`- Any valid scalar | string | vector | matrix

## Outputs

- R
- nan array.

## Example

Common NaN return:

```
R = 0/0
R = NaN
R = Inf/Inf
R = 0 * Inf
```

`R = NaN`

## Comments

ee IEEE 754 floating-point standard.

Two NaN values cannot be commpared by == operator or isequal function. To compare NaN, isnan function is required.