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Add a function that updates value of the count min sketch instead of updating it one at a time #38

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Add a function that updates value of the count min sketch instead of updating it one at a time #38

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11 changes: 11 additions & 0 deletions countmin.go
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,17 @@ func (c *CountMinSketch) Add(data []byte) *CountMinSketch {
return c
}

func (c *CountMinSketch) Set(data []byte, count uint64) *CountMinSketch {
lower, upper := hashKernel(data, c.hash)

// Increment count in each row.
for i := uint(0); i < c.depth; i++ {
c.matrix[i][(uint(lower)+uint(upper)*i)%c.width] = count
}

return c
}

// Count returns the approximate count for the specified item, correct within
// epsilon * total count with a probability of delta.
func (c *CountMinSketch) Count(data []byte) uint64 {
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