log method

Composes a function that returns the natural logarithm of this function's field result across its extent.

The function result has no data where this function's field result has no data.

The function result has no data where this function's field result is less than or equal to 0.

The function result extent equals that of this function's field result.

Return Value: A function that returns the natural logarithm of this function's field result across its extent.