# $EPIC: atan.txt,v 1.3 2006/08/21 01:55:33 sthalik Exp $
======Synopsis:======
$[[atan]](//<number>//)

======Technical:======
  * Returns the principal value in radians of the arc tangent of //<number>//.
  * If the <number> argument is omitted the empty string is returned.
  * As always, the return value is limited to 6 decimal places.
  * As always, DOM or RANGE means there was an error.

======Returns:======
The arc tangent of an angle

======History:======