ATAN2

Syntax

Description of the illustration atan2.eps

Purpose

ATAN2 returns the arc tangent of n1 and n2. The argument n1 can be in an unbounded range and returns a value in the range of -pi to pi, depending on the signs of n1 and n2, expressed in radians.

This function takes as arguments any numeric data type or any nonnumeric data type that can be implicitly converted to a numeric data type. If any argument is BINARY_FLOAT or BINARY_DOUBLE, then the function returns BINARY_DOUBLE. Otherwise the function returns NUMBER.

See Also:

ATAN for information on the ATAN function and Table 2-8 for more information on implicit conversion

Examples

The following example returns the arc tangent of .3 and .2:

SELECT ATAN2(.3, .2) "Arc_Tangent2"
  FROM DUAL;
 
Arc_Tangent2
------------
  .982793723