=over
=item log EXPR
=item log
Returns the natural logarithm (base I) of EXPR. If EXPR is omitted,
returns log of C<$_>. To get the log of another base, use basic algebra:
The base-N log of a number is 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 L for the inverse operation.
=back