Returns the arc-tangent, in radians, of a number.

Syntax

ATAN( numeric-expression )

Remarks

The ATAN and TAN functions are inverse operations.

Parameters

Returns

DOUBLE

Remarks

This function converts its argument to DOUBLE, and performs the computation in double-precision floating point.

See also

• ACOS function [Numeric]
• ASIN function [Numeric]
• ATAN2 function [Numeric]
• TAN function [Numeric]

Standards and compatibility

Example

The following statement returns the arc-tangent value for 0.52.

SELECT ATAN( 0.52 );