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{{alias}}()
Returns an accumulator function which incrementally computes the mean
arctangent absolute percentage error (MAAPE).
If provided input values, the accumulator function returns an updated mean
arctangent absolute percentage error. If not provided input values, the
accumulator function returns the current mean arctangent absolute percentage
error.
Note that, unlike the mean absolute percentage error (MAPE), the mean
arctangent absolute percentage error is expressed in radians on the interval
[0,π/2].
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 m = accumulator()
null
> m = accumulator( 2.0, 3.0 )
~0.3218
> m = accumulator( 5.0, 2.0 )
~0.6523
> m = accumulator()
~0.6523
See Also
--------
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