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Oracle® Database SQL Language Reference
11g Release 1 (11.1)

B28286-07
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ATAN2

Syntax

Description of atan2.gif follows
Description of the illustration atan2.gif

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. ATAN2(n1,n2) is the same as ATAN(n1/n2).

This function takes as arguments any numeric datatype or any nonnumeric datatype that can be implicitly converted to a numeric datatype. 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 2-10, "Implicit Type Conversion Matrix" 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
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  .982793723