40 lines
891 B
Plaintext
40 lines
891 B
Plaintext
|
|
{{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
|
|
--------
|
|
|