return the natural logarithm of a number

Contract
Return type	wob
No input parameters.

Water Contract
<method number.double.log/>

See also: log, double

Returns the natural logarithm of a _subject of type double as a double . Information for the mathematical constant e , on which log is based, is found in the documentation for number.double .

100.0.<log />

4.605170185988092

number.double.e.<power 4.605170185988092 />

100.0

If the _subject is negative, log returns a value of NaN (not a number).

-100.0.<log />.<is_nan />

true