LOG( ) function
Returns the logarithm (base 10) of a numeric expression or field value with a specified number of decimal places.
Syntax
LOG(number, decimals)
Parameters
| Name | Type | Description |
|---|---|---|
| number | numeric |
The value to find the logarithm for. |
| decimals | numeric | The number of decimal places for the return value. |
Output
Numeric.
Examples
Basic examples
Returns 3.0000:
LOG(1000, 4)
Returns 4.86:
LOG(72443, 2)
Advanced examples
Finding the cube root
Creates a field that is the cube root of the field X to two decimal places:
DEFINE FIELD Cube_root COMPUTED EXP(LOG(X, 6) / 3, 2)
Note
You determine the nth root by dividing the log of the value by n and taking the exponential value of the result.
Remarks
How it works
The logarithm of a number is the exponent (or power) of 10 needed to generate that number. Therefore, the logarithm of 1000 is 3.
Related functions
The LOG( ) function is the inverse of the EXP( ) function.
