log - retrieve the natural logarithm for a number


NAME

log - retrieve the natural logarithm for a number


SYNOPSIS

log EXPR

log


DESCRIPTION

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