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https://issues.apache.org/jira/browse/MATH-978?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13663123#comment-13663123
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Ajo Fod commented on MATH-978:
------------------------------
Code to be added to StorelessCovariance:
public void append(StorelessCovariance sc) throws
DimensionMismatchException{
if (sc.dimension != dimension) {
throw new DimensionMismatchException(sc.dimension, dimension);
}
// only update the upper triangular part of the covariance matrix
// as only these parts are actually stored
for (int i = 0; i < dimension; i++){
for (int j = i; j < dimension; j++){
getElement(i, j).append(sc.getElement(i, j));
}
}
}
> StorelessCovariance to be map/reducable
> ---------------------------------------
>
> Key: MATH-978
> URL: https://issues.apache.org/jira/browse/MATH-978
> Project: Commons Math
> Issue Type: New Feature
> Reporter: Ajo Fod
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> Current version of StorelessCovariance and StorelessBivariateCovariance don't
> allow adding another StorelessCovariance to an existing one. With this
> feature it is possible to run maps on different data sets and then do a final
> reduce to get the overall covariance.
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