/
avgint.go
79 lines (67 loc) · 1.66 KB
/
avgint.go
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package main
import "math"
import "sync/atomic"
type averageInt64 struct {
n int64
minval int64
maxval int64
sum int64
sumsq uint64 // float64
init int64 // bool
}
func (av *averageInt64) add(sample int64) {
atomic.AddInt64(&av.n, 1)
atomic.AddInt64(&av.sum, sample)
sumsq := math.Float64frombits(atomic.LoadUint64(&av.sumsq))
f := float64(sample)
sumsq += f * f
atomic.StoreUint64(&av.sumsq, math.Float64bits(sumsq))
init, minval := atomic.LoadInt64(&av.init), atomic.LoadInt64(&av.minval)
if init == 0 || sample < minval {
atomic.StoreInt64(&av.minval, sample)
atomic.StoreInt64(&av.init, 1)
}
maxval := atomic.LoadInt64(&av.maxval)
if maxval < sample {
atomic.StoreInt64(&av.maxval, sample)
}
}
func (av *averageInt64) min() int64 {
return atomic.LoadInt64(&av.minval)
}
func (av *averageInt64) max() int64 {
return atomic.LoadInt64(&av.maxval)
}
func (av *averageInt64) samples() int64 {
return atomic.LoadInt64(&av.n)
}
func (av *averageInt64) total() int64 {
return atomic.LoadInt64(&av.sum)
}
func (av *averageInt64) mean() int64 {
n, sum := atomic.LoadInt64(&av.n), atomic.LoadInt64(&av.sum)
if n == 0 {
return 0
}
return int64(float64(sum) / float64(n))
}
func (av *averageInt64) variance() float64 {
n, sumsq := atomic.LoadInt64(&av.n), atomic.LoadUint64(&av.sumsq)
if n == 0 {
return 0
}
nf, meanf := float64(n), float64(av.mean())
sumsqf := math.Float64frombits(sumsq)
return (sumsqf / nf) - (meanf * meanf)
}
func (av *averageInt64) sd() float64 {
n := atomic.LoadInt64(&av.n)
if n == 0 {
return 0
}
return math.Sqrt(av.variance())
}
func (av *averageInt64) clone() *averageInt64 {
newav := (*av)
return &newav
}