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{{alias}}()
Returns an accumulator function which incrementally computes an arithmetic
mean of squared absolute values.
If provided a value, the accumulator function returns an updated mean. If
not provided a value, the accumulator function returns the current mean.
If provided `NaN` or a value which, when used in computations, results in
`NaN`, the accumulated value is `NaN` for all future invocations.
Returns
-------
acc: Function
Accumulator function.
Examples
--------
> var accumulator = {{alias}}();
> var mu = accumulator()
null
> mu = accumulator( 2.0 )
4.0
> mu = accumulator( -5.0 )
14.5
> mu = accumulator()
14.5
See Also
--------
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