ATAN2
The ATAN2 function returns the arc tangent of x and y coordinates as an angle expressed in radians. The first and second arguments specify the x and y coordinates, respectively.
- expression-1
- An expression that returns a value of any built-in numeric data type (except for DECFLOAT), character-string, or graphic-string data type. A string argument is cast to double-precision floating point before evaluating the function. For more information on converting strings to double-precision floating point, see DOUBLE_PRECISION or DOUBLE. If one argument is 0, the other argument must not be 0.
- expression-2
- An expression that returns a value of any built-in numeric data type (except for DECFLOAT), character-string, or graphic-string data type. A string argument is cast to double-precision floating point before evaluating the function. For more information on converting strings to double-precision floating point, see DOUBLE_PRECISION or DOUBLE. If one argument is 0, the other argument must not be 0.
The data type of the result is double-precision floating point. If any argument can be null, 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.
Returns a double precision floating-point number with an approximate value of 1.1071487.SELECT ATAN2(:HATAN2A,:HATAN2B) FROM SYSIBM.SYSDUMMY1