Log - Find logarithm of numeric value in Informatica

Log function is mathematical log equivalent function
Syntax
LOG( base, exponent )

ArgumentRequired/OptionalDescription
baseRequiredThe base of the logarithm. Must be a positive numeric value other than 0 or 1.Any valid transformation expression that evaluates to a positive number other than 0 or 1.
exponentRequiredThe exponent of the logarithm. Must be a positive numeric value greater than 0. Any valid transformation expression that evaluates to a positive number greater than 0.

Example : Find Log values
BASEEXPONENTRETURN VALUE
1510
.0910-0.956244644696599
NULL18NULL
35.78NULLNULL
-918Error. (Integration Service does not write the row.)
05Error. (Integration Service does not write the row.)
10-2Error. (Integration Service does not write the row.)