remove Unused parameter 'sf' in calcTrendValue function (#6900)
Signed-off-by: fuling <fuling.lgz@alibaba-inc.com>
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@ -193,10 +193,11 @@ func instantValue(vals []parser.Value, out Vector, isRate bool) Vector {
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// Calculate the trend value at the given index i in raw data d.
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// This is somewhat analogous to the slope of the trend at the given index.
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// The argument "s" is the set of computed smoothed values.
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// The argument "b" is the set of computed trend factors.
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// The argument "d" is the set of raw input values.
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func calcTrendValue(i int, sf, tf, s0, s1, b float64) float64 {
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// The argument "tf" is the trend factor.
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// The argument "s0" is the computed smoothed value.
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// The argument "s1" is the computed trend factor.
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// The argument "b" is the raw input value.
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func calcTrendValue(i int, tf, s0, s1, b float64) float64 {
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if i == 0 {
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return b
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}
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@ -249,7 +250,7 @@ func funcHoltWinters(vals []parser.Value, args parser.Expressions, enh *EvalNode
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x = sf * samples.Points[i].V
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// Scale the last smoothed value with the trend at this point.
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b = calcTrendValue(i-1, sf, tf, s0, s1, b)
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b = calcTrendValue(i-1, tf, s0, s1, b)
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y = (1 - sf) * (s1 + b)
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s0, s1 = s1, x+y
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