CFLib.org – Common Function Library Project

Description:
Returns the logarithm to the base 2 of the value.

Return Values:
Returns a simple value.

Example:

<CFSET n=8>
  <CFOUTPUT>
  Given n=8
  The Log2 of #n# is: #Log2(n)#
  </CFOUTPUT>

Parameters:

Full UDF Source:

/**
 * Returns the logarithm to the base 2 of the value.
 * 
 * @param value      real number > 0. 
 * @return Returns a simple value. 
 * @author Joel Cox (jlcox@goodyear.com) 
 * @version 1, October 9, 2001 
 */
function Log2(x)
{
  if (x GT 0)
      Return(Log(x) / Log(2));
  else
      Return("undefined");
}