ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 18. ActionScript Language Reference
Math.log( ) Method
Flash 5; can be used when exporting Flash 4 movies
compute the natural logarithm of a number
Math.log(x)
Arguments
x
A positive integer.
Returns
The natural logarithm of x.
Description
The log( ) method calculates the natural logarithm (i.e., the base-e logarithm) of a number. See the following Example to calculate the base-10 logarithm.
Example
trace (Math.log(Math.E)); // Displays: 1 // Compute the base-10 logarithm of a number function log10 (x) { return (Math.log(x) / Math.log(10)); }