46 lines
1.1 KiB
Plaintext
46 lines
1.1 KiB
Plaintext
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{{alias}}( W )
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Returns an accumulator function which incrementally computes a moving sum of
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products.
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The `W` parameter defines the number of (x,y) pairs over which to compute
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the moving sum of products.
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If provided input values, the accumulator function returns an updated moving
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sum. If not provided input values, the accumulator function returns the
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current moving sum.
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As `W` (x,y) pairs are needed to fill the window buffer, the first `W-1`
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returned values are calculated from smaller sample sizes. Until the window
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is full, each returned value is calculated from all provided values.
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Parameters
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----------
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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 s = accumulator()
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null
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> s = accumulator( 2.0, 3.0 )
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6.0
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> s = accumulator( -5.0, 2.0 )
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-4.0
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> s = accumulator( 3.0, -2.0 )
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-10.0
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> s = accumulator( 5.0, 3.0 )
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-1.0
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> s = accumulator()
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-1.0
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See Also
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--------
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