log
- 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.