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https://issues.apache.org/jira/browse/MATH-1120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14040590#comment-14040590
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Luc Maisonobe commented on MATH-1120:
-------------------------------------
Yes, but the intermediate instances only copy references, so its only a few
bytes.
We use the same pattern elsewhere (currently only in a small part of
optimization) and intend to use it further (for example in ODE). Having the
instance themselves implement the withXxx allow the following use case:
{code}
Algo a = new Algo().withX().withY();
double result1 = a.doSomeHugeComputation();
Algo b = a.withZ();
double result2 = b.doSomeHugeComputation();
double delta = result2 - result1; // here, we have the differential effect of
the withZ() setting
{code}
> Need Percentile computations that can be matched with standard spreadsheet
> formula
> ----------------------------------------------------------------------------------
>
> Key: MATH-1120
> URL: https://issues.apache.org/jira/browse/MATH-1120
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: 3.2
> Reporter: Venkatesha Murthy TS
> Labels: Percentile
> Fix For: 4.0
>
> Attachments: 18-jun-percentile-with-estimation-patch,
> excel-percentile-patch, percentile-with-estimation-patch, r-output.txt
>
> Original Estimate: 504h
> Remaining Estimate: 504h
>
> The current Percentile implementation assumes and hard-codes the quantile pth
> position as
> p * (N+1)/100 and provides a kth selected value.
> However if we need to verify compare/contrast with standard statistical tools
> such as say MS Excel; it would be good to provide an extensible way of
> morphing this selection of position than hard code.
> For example in order to generate the percentile closely matching with MS
> Excel the position required may be [p*(N-1)/100]+1.
> Please let me know if i could submit this as a patch.
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