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{{alias}}()
Returns an accumulator function which incrementally computes a sum.
If provided a value, the accumulator function returns an updated sum. If not
provided a value, the accumulator function returns the current sum.
If provided `NaN` or a value which, when used in computations, results in
`NaN`, the accumulated value is `NaN` for all future invocations.
For long running accumulations or accumulations of large numbers, care
should be taken to prevent overflow.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}();
> var s = accumulator()
null
> s = accumulator( 2.0 )
2.0
> s = accumulator( -5.0 )
-3.0
> s = accumulator()
-3.0
See Also
--------
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