EXP scalar function
The EXP function returns a value that is the base of the natural logarithm (e) raised to a power specified by the argument. The EXP and LN functions are inverse operations.
The schema is SYSIBM. (The SYSFUN version of the EXP function continues to be available.)
- expression
- An expression that returns a value of any built-in numeric data type. If the value is of decimal floating-point data type, the operation is performed in decimal floating-point; otherwise, the value is converted to double-precision floating-point for processing by the function.
If the argument is DECFLOAT(n), the result is DECFLOAT(n); otherwise, the result is a double-precision floating-point number. If the argument can be null, the result can be null; if the argument is null, the result is the null value.
Notes
- Results involving DECFLOAT special values: For decimal
floating-point values, the special values are treated as follows:
- EXP(NaN) returns NaN.
- EXP(-NaN) returns -NaN.
- EXP(Infinity) returns Infinity.
- EXP(-Infinity) returns 0.
- EXP(sNaN) returns NaN and a warning.
- EXP(-sNaN) returns -NaN and a warning.
Example
Assume that E is a DECIMAL(10,9) host variable
with a value of 3.453789832.
VALUES EXP(:E)