# ATAN¶

The **ATAN** function calculates the arctangent, or inverse tangent, (in radians) of the given value.

## Usage¶

`atan(num) : num`

## Examples¶

The following example creates a single NOR row with a column x that calculates the arctangent of 1.0 resulting in an answer of 0.7854 (which is 45° in radians).

```
NORROWS 1 | CALC x atan(1)
```