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From "Mikkel Meyer Andersen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MATH-384) DescriptiveStatistics based on double[]
Date Wed, 14 Jul 2010 22:18:54 GMT

    [ https://issues.apache.org/jira/browse/MATH-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12888575#action_12888575
] 

Mikkel Meyer Andersen commented on MATH-384:
--------------------------------------------

You're probably right. What about just adding the constructor
public ResizableDoubleArray(double[] initialArray) {
  internalArray = initialArray;
}
to ResizableArray (possibly with checking if initialArray == null). It would give a sufficiently
efficient ResizableArray (in the case given it is not going to be expanded or anything), would
it not?

> DescriptiveStatistics based on double[]
> ---------------------------------------
>
>                 Key: MATH-384
>                 URL: https://issues.apache.org/jira/browse/MATH-384
>             Project: Commons Math
>          Issue Type: New Feature
>            Reporter: Mikkel Meyer Andersen
>            Priority: Minor
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> Right now the DescriptiveStatistics is for ResizableDoubleArray, but if the user has
the double[] data she wishes to get DescriptiveStatistics for there is no way of doing this
(besides the inefficient way of creating a ResizableDoubleArray from the double[]).
> It would be possible to use StatUtils, but it does not contain near as much functionality
as DescriptiveStatistics.
> Idea: Create a DescriptiveStatistics for double[] also. I'm not sure which way of implementing
it would be the best, but one way would be to make DescriptiveStatistics abstract with all
but the apply-method implemented as now. The apply-method should be made as abstract which
then has to implemented in the extensions together with a field containing the values. (addValue,
windowSize etc. has to go in the ResizableDoubleArray-extension.) The double[]-extension should
then have a constructor taking double[] as a parameter.

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