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


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

See Also:

ATAN2 for information about the ATAN2 function and Table 2-10, "Implicit Type Conversion Matrix" for more information on implicit conversion


The following example returns the arc tangent of .3:

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