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{{alias}}( W )
Returns an accumulator function which incrementally computes a moving 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.
The `W` parameter defines the number of values over which to compute
the moving mid-range.
If provided a value, the accumulator function returns an updated moving mid-
range. If not provided a value, the accumulator function returns the current
moving mid-range.
As `W` values are needed to fill the window buffer, the first `W-1` returned
values are calculated from smaller sample sizes. Until the window is full,
each returned value is calculated from all provided values.
Parameters
----------
W: integer
Window size.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}( 3 );
> var mr = accumulator()
null
> mr = accumulator( 2.0 )
2.0
> mr = accumulator( -5.0 )
-1.5
> mr = accumulator( 3.0 )
-1.0
> mr = accumulator( 5.0 )
0.0
> mr = accumulator()
0.0
See Also
--------
|
