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https://issues.apache.org/jira/browse/NUMBERS-163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17362553#comment-17362553
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Matt Juntunen commented on NUMBERS-163:
---------------------------------------
I agree that we should keep the static methods. There is no need to instantiate
an object to perform the computation in the simple cases.
Additionally, I don't see how this addresses my use cases. Specifically, I want
to replace the use of {{double}} accumulators
[here|https://github.com/apache/commons-geometry/blob/master/commons-geometry-spherical/src/main/java/org/apache/commons/geometry/spherical/twod/RegionBSPTree2S.java#L173]
(technically a {{Vector3D}} accumulator) with extended precision accumulators.
The result would look something like this:
{code:java}
Summation.Accumulator xacc = Summation.accumulator();
Summation.Accumulator yacc = Summation.accumulator();
Summation.Accumulator zacc = Summation.accumulator();
for (final ConvexArea2S area : areas) {
// ...
xacc.add(centroidVector.getX());
yacc.add(centroidVector.getY());
zacc.add(centroidVector.getZ());
}
Vector3D centroidVectorSum = Vector3D.of(
xacc.get(),
yacc.get(),
zacc.get());
{code}
> Summation and LinearCombination Accumulators
> --------------------------------------------
>
> Key: NUMBERS-163
> URL: https://issues.apache.org/jira/browse/NUMBERS-163
> Project: Commons Numbers
> Issue Type: New Feature
> Reporter: Matt Juntunen
> Priority: Major
>
> It would be useful to have simple accumulator classes in {{Summation}} and
> {{LinearCombination}} to perform extended precision operations on arbitrary
> collections of values without requiring conversion to {{double[]}}. Ex:
> {code:java}
> Summation.Accumulator sum= Summation.accumulator(1d);
> sum.add(x)
> .add(y)
> .add(z)
> .add(w);
> double sumResult = sum.get();
> LinearCombination.Accumulator comb = LinearCombination.accumulator(1d);
> comb.add(x, scale)
> .add(y, scale)
> .add(z, scale)
> .add(w, scale);
> double combResult = comb.get();
> {code}
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