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{{alias}}( W )
Returns an accumulator function which incrementally computes a moving sum of
products.
The `W` parameter defines the number of (x,y) pairs over which to compute
the moving sum of products.
If provided input values, the accumulator function returns an updated moving
sum. If not provided input values, the accumulator function returns the
current moving sum.
As `W` (x,y) pairs 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 s = accumulator()
null
> s = accumulator( 2.0, 3.0 )
6.0
> s = accumulator( -5.0, 2.0 )
-4.0
> s = accumulator( 3.0, -2.0 )
-10.0
> s = accumulator( 5.0, 3.0 )
-1.0
> s = accumulator()
-1.0
See Also
--------
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