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{{alias}}()
Returns an accumulator function which incrementally computes a weighted
arithmetic mean.
If provided arguments, the accumulator function returns an updated weighted
mean. If not provided arguments, the accumulator function returns the
current weighted mean.
If provided `NaN` or a value which, when used in computations, results in
`NaN`, the accumulated value is `NaN` for all future invocations.
The accumulator function accepts two arguments:
- x: value
- w: weight
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}();
> var mu = accumulator()
null
> mu = accumulator( 2.0, 1.0 )
2.0
> mu = accumulator( 2.0, 0.5 )
2.0
> mu = accumulator( 3.0, 1.5 )
2.5
> mu = accumulator()
2.5
See Also
--------
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