50 lines
1.3 KiB
Plaintext
50 lines
1.3 KiB
Plaintext
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{{alias}}( [out,] W )
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Returns an accumulator function which incrementally computes a moving
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arithmetic mean and unbiased sample variance.
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The `W` parameter defines the number of values over which to compute the
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moving arithmetic mean and unbiased sample variance.
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If provided a value, the accumulator function returns updated accumulated
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values. If not provided a value, the accumulator function returns the
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current moving accumulated values.
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As `W` values are needed to fill the window buffer, the first `W-1` returned
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accumulated values are calculated from smaller sample sizes. Until the
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window is full, each returned accumulated value is calculated from all
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provided values.
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Parameters
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----------
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out: Array|TypedArray (optional)
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Output array.
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W: integer
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Window size.
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Returns
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-------
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acc: Function
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Accumulator function.
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Examples
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--------
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> var accumulator = {{alias}}( 3 );
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> var v = accumulator()
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null
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> v = accumulator( 2.0 )
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[ 2.0, 0.0 ]
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> v = accumulator( -5.0 )
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[ -1.5, 24.5 ]
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> v = accumulator( 3.0 )
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[ 0.0, 19.0 ]
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> v = accumulator( 5.0 )
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[ 1.0, 28.0 ]
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> v = accumulator()
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[ 1.0, 28.0 ]
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See Also
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--------
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