log - retrieve the natural logarithm for a number

- NAME
- SYNOPSIS
- DESCRIPTION

# 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