Constructs a new aggregator.
Extreme.Numerics.Net40 (in Extreme.Numerics.Net40.dll) Version: 6.0.16073.0 (6.0.16073.0)
Use this constructor to create an aggregator whose return type is determined
at runtime. For example, an aggregator that returns the first observation in each interval
returns a variable of the same type as the variable that is being aggregated.
Supported in: 5.x, 4.x