log - retrieve the natural logarithm for a number |
log - retrieve the natural logarithm for a number
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 in the perlfunc manpage for the inverse operation.
log - retrieve the natural logarithm for a number |