log

Calculates the natural logarithm of N expressed as a float. If N <= 0.0, then a warning is output and NULL is returned.

FLOAT log(NUMBER 
N
)
Table 1. log Function examples
Expression Result 
log(1)
0.000000 
log(10)
1.000000 
log(100)
2.000000 
log(1000)
2.000000 
log(-1.0)
NULL