--- "Mark R. Diggory" <[EMAIL PROTECTED]> wrote:
> Al Chou wrote:
> > --- "Mark R. Diggory" <[EMAIL PROTECTED]> wrote:
...
> >>2.) Like in my last emails concerning "Univariate" I would like to, (and
> >>have done so in my checkout successfully) Make the following Class changes:
> >>
> >>interface o.a.c.m.stat.StoreUnivariate -->
> >> abstract class o.a.c.m.stat.DescriptiveStatistics
> >>
> >>this actually becomes a factory class and uses Discovery to instantiate
> >>new instances of the following implementations
> >>
> >>*default implementation*
> >>o.a.c.m.stat.StoreUnivariateImpl -->
> >> o.a.c.m.stat.univariate.StatisticsImpl
> >
> >
> > Forgive me for not refamiliarizing myself with the code first, but should
> the
> > storeless version perhaps be the default implementation instead? What do
> we
> > lose by going that way? I'm thinking it would be nice to keep memory usage
> > lower if possible.
>
> The Storeless version (UnivariateImpl) doesn't support rank Statistics
> because of its storeless nature, the more fully featured implementation
> is StoreUnivariateImpl, it does everything, but has the limitation of
> requiring storage of the values. These are two different implementations
> with different internal storage configurations. I choose
> StoreUnivariateImpl because I think the default should have full
> capabilities.
>
> The storeless version is more of an Optimized solution, It probably wise
> to suggest that one use it only if one needs that functionality (ie
> trying to get moments across huge datasets or realtime value streams of
> sorts)
That sounds reasonable. Thanks for the refresher (I looked at the current code
based on your remarks, too).
> > Before we go overboard, can you give a quick example of instantiating one
> of
> > the implementations? Or perhaps, both the default and one alternative
...
> Yes, like that
>
> For the default Discovery configured implementation:
>
> DescriptiveStatistics stats = DescriptiveStatistics.newInstance();
>
> stats.addValue(5.0);
> ...
>
> double mean = stats.getMean();
>
>
> For any alternate Implementations:
>
> DescriptiveStatistics stats =
> DescriptiveStatistics.newInstance(StorelessDescriptiveStatisticsImpl.class);
>
> stats.addValue(5.0);
> ...
>
> double mean = stats.getMean();
>
> and/or
>
> DescriptiveStatistics stats =
>
DescriptiveStatistics.newInstance("o.a.c.math.stat.impl.StorelessDescriptiveStatisticsImpl");
>
> stats.addValue(5.0);
> ...
>
> double mean = stats.getMean();
>
> depending n which people like more
OK, I see. The one thing I notice is that the names are getting awfully long,
especially for the non-default case. I guess that's a price we pay for having
descriptive (no play on words intended) names like DescriptiveStatistics....
Al
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