[jira] [Created] (NUMBERS-163) Summation and LinearCombination Accumulators

["Matt Juntunen (Jira)" <ji...@apache.org>]

Matt Juntunen created NUMBERS-163:
-------------------------------------

             Summary: 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


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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