# System Functions

LOG( ) | Return Base 10 Logarithm

## Format

LOG(num[,ERR=stmtref])
Where:

num | Numeric expression whose Base 10 logarithm is to be returned.
stmtref | Program line number or statement label to which to transfer control.

## Returns

Numeric, Base 10 logarithm.

## Description

The LOG( ) function returns the numeric Base 10 logarithm of a given number, rounded to the current PRECISION setting. This is the inverse of the EXP( ) function.

PxPlus returns Error #40: Divide check or numeric overflow if the numeric value is negative.

## Example

print exp(log(90)/3) ! Print cube root of 90