ATAN2
The ATAN2 function returns the arc tangent of x and y coordinates as an angle, expressed in radians.
The schema is SYSIBM.
The first and second arguments specify the x and y coordinates, respectively.
Each argument must be an expression that returns the value of any built-in numeric data type that is not DECFLOAT. Both arguments must not be 0. Any argument that is not a double precision floating-point number is converted to one for processing by the function.
The result of the function is a double precision floating-point number.
The result can be null; if any argument is null, the result is the null value.
Example: Assume
that host variables HATAN2A and HATAN2B are DOUBLE host variables
with values of 1 and 2, respectively. The following statement returns
a double precision floating-point number with an approximate value
of 1.1071487:
SELECT ATAN2(:HATAN2A,:HATAN2B)
FROM SYSIBM.SYSDUMMY1;