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https://issues.apache.org/jira/browse/NUMBERS-163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17362558#comment-17362558
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Matt Juntunen commented on NUMBERS-163:
---------------------------------------
No, it accumulates them. The basic structure should look like below. I have a
specific idea for the API, I just haven't had time yet to write it.
{code:java}
static class Accumulator {
private double sum;
private double comp;
public Accumulator add(double d) {
double t = sum + d;
comp += ExtendedPrecision.twoSumLow();
sum = t;
return this;
}
public double get() {
return summationResult(sum, comp);
}
}
{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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