# FX_AtanIdx

## C Specification

      #include <nitro/fx/fx_trig.h>

      u16 FX_AtanIdx( fx32   x );

## Arguments

x | An `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`

## Revision History

06/16/2004 Initial version.

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