IndexedSeqSemigroup
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package algebird
Returns an instance of
T calculated by summing all instances in iter in one pass.
Returns an instance of
T calculated by summing all instances in iter in one pass. Returns None if
iter is empty, else Some[
T].
instances of
T to be combined
None if iter is empty, else an option value containing the summed
T
Note that this works similar to Semigroup[Map[Int,T]] not like Semigroup[List[T]] This does element-wise operations, like standard vector math, not concatenation, like Semigroup[String] or Semigroup[List[T]]
If l.size != r.size, then only sums the elements up to the index min(l.size, r.size); appends the remainder to the result.