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Oracle® Database SQL Language Reference
11g Release 2 (11.2)

Part Number E17118-03
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ATAN

Syntax

Description of atan.gif follows
Description of the illustration atan.gif

Purpose

ATAN returns the arc tangent of n. The argument n can be in an unbounded range and returns a value in the range of -pi/2 to pi/2, expressed in radians.

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

See Also:

ATAN2 for information about the ATAN2 function and Table 3-10, "Implicit Type Conversion Matrix" for more information on implicit conversion

Examples

The following example returns the arc tangent of .3:

SELECT ATAN(.3) "Arc_Tangent"
  FROM DUAL;

Arc_Tangent
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