<log> computes the natural logarithmic function.
<log> takes one argument: x. If no argument is given, an error occurs.
<log> returns the natural logarithm of its argument. If the argument does not evaluate to a positive finite number, <log> returns an indeterminate result.
Example 6.
<libxexpr:log> <libxexpr:exp>2</libxexpr:exp> </libxexpr:log> --> <float>2</float>