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{{alias}}()
Returns an accumulator function which incrementally computes a mid-range.
The mid-range is the arithmetic mean of maximum and minimum values.
Accordingly, the mid-range is the midpoint of the range and a measure of
central tendency.
If provided a value, the accumulator function returns an updated mid-range.
If not provided a value, the accumulator function returns the current mid-
range.
If provided `NaN`, the mid-range is `NaN` for all future invocations.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}();
> var v = accumulator()
null
> v = accumulator( 3.14 )
3.14
> v = accumulator( -5.0 )
~-0.93
> v = accumulator( 10.1 )
2.55
> v = accumulator()
2.55
See Also
--------
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