# FX_AtanIdx

## Syntax

      #include <nitro/fx/fx_trig.h>

      u16 FX_AtanIdx( fx32   x );

## Arguments

x | `fx32`-format fixed-point decimal.

## Return Values

Arctangent of `x`

## Description

This determines the arctangent of `x`. The results are returned in a `u16` format. The units of the result are equal to 1/65536 of a circle (2 π radians). (Example: A right angle would be 16384.) Internally, a table is referenced.

## See Also

`FX_Atan, FX_Atan2, FX_Atan2Idx, FX_AsinIdx, FX_AcosIdx`

## Revision History

2004/06/16 Initial version.

CONFIDENTIAL