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https://issues.apache.org/jira/browse/MAHOUT-1753?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dmitriy Lyubimov updated MAHOUT-1753:
-------------------------------------
Description:
R analogs: mean(), rowCols(), rowMeans(), variance(), sd().
Since it presents an efficiency problem to compute second and first moment as
two different routines, this issue suggest to unify computation of both first
and second moments in the same routine.
For completeness, we do both in-core and distriuted variations, by convention
prepending distributed versions with "d" letter:
colMeanVars()
colMeanStdevs()
dcolMeanVars()
dcolMeanStdevs()
> First and second moment routines
> ---------------------------------
>
> Key: MAHOUT-1753
> URL: https://issues.apache.org/jira/browse/MAHOUT-1753
> Project: Mahout
> Issue Type: Blog - New Blog Request
> Reporter: Dmitriy Lyubimov
> Fix For: 0.10.2
>
>
> R analogs: mean(), rowCols(), rowMeans(), variance(), sd().
> Since it presents an efficiency problem to compute second and first moment as
> two different routines, this issue suggest to unify computation of both first
> and second moments in the same routine.
> For completeness, we do both in-core and distriuted variations, by convention
> prepending distributed versions with "d" letter:
> colMeanVars()
> colMeanStdevs()
> dcolMeanVars()
> dcolMeanStdevs()
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