[jira] Commented: (MATH-384) DescriptiveStatistics based on double[]

["Phil Steitz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MATH-384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12888565#action_12888565 ] 

Phil Steitz commented on MATH-384:
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+1 to add the functionality.  Another approach would be to simply add a method addValues(double[]) to DescriptiveStatistics.  This would be a little tricky to implement efficiently (possibly requiring modifications to ResizeableDoubleArray) but maybe a little simpler from an interface perspective.

Yet another idea to consider is to create a value interface (or possibly better a class) similar to StatisticalSummaryValues including all of the statistics maintained by DescriptiveStatistics and then just add a static method to StatUtils that takes a double[] and returns one of these.  The same could be done for StatisticalSummaryValues - methods named descriptiveStatistics(double[]) and statisticalSummary(double[]).

Any other ideas or reasons that any of these are not good?

> 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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