-- Perl 5.8.7 documentation --
  • log EXPR
  • log

    Returns the natural logarithm (base e) of EXPR. If EXPR is omitted, returns log of $_ . To get the log of another base, use basic algebra: The base-N log of a number is equal to the natural log of that number divided by the natural log of N. For example:

        sub log10 {
    	my $n = shift;
    	return log($n)/log(10);

    See also exp for the inverse operation.