[math] Thoughts on efficiency in ListUnivariates

["Mark R. Diggory" <md...@latte.harvard.edu>]

The new ListUnivariateImpl gives an opportunity to ponder a couple 
different approaches and their efficiency issues.

Current approach: Iterate over list and transform objects to doubles, 
inserting these doubles into a double[] and passing it to the 
appropriate UnivarStatistic object's evaluate method.

Primarily Issue: The double[] is regenerated for every getXXX call.

Pros: The "change in state" of the external list doesn't need to be 
monitored.

Cons: Not a very efficient means of working with the Lists.

Would it would be better if the state of the list could be monitored and 
the double[] regenerated if an object has been added/removed from the 
list? Are there known means of "listening to Collections".

-Mark


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