shit on stats

stats.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"math"
 )
 
 var _ = fmt.Print
@@ -9,20 +10,34 @@ var _ = fmt.Print
 const initialLength int = 1024
 const verySmall float64 = -100000
 const veryBig float64 = 100000
+const epsilon = 0.00000002
 
 type StatAggregator struct {
 	sum             float64
 	sumOfTheSquares float64
 	n               int
-	histogram       []float64
-	min             float64
-	max             float64
+	// histogram is a list of point between [min max] each point in the
+	//histogram represents the beginning of the histogram bars.
+	histogram            []float64
+	histogramValues      []int
+	histogramBarWidth    float64
+	numberOfHistogramBar int
+	min                  float64
+	max                  float64
 }
 
 type Stats struct{}
 
 func NewStatAggregator() *StatAggregator {
-	return &StatAggregator{0, 0, 0, make([]float64, initialLength), veryBig, verySmall}
+	return &StatAggregator{0,
+		0,
+		0,
+		make([]float64, 0, initialLength),
+		make([]int, 0, initialLength),
+		0,
+		initialLength,
+		veryBig,
+		verySmall}
 }
 
 func (this *StatAggregator) AddStats(dataChannel chan float64, output chan *Stats) {
@@ -39,3 +54,37 @@ func (this *StatAggregator) AddStats(dataChannel chan float64, output chan *Stat
 	}
 	output <- nil
 }
+
+//  always assume the min and max includes the value!
+func (this *StatAggregator) AddDataToHistogram(value float64) {
+	if len(this.histogramValues) < this.numberOfHistogramBar {
+		this.AddDataToHistogramWhenLessDataThanBarAreOnHistograms(value)
+	} else {
+		this.AddDataToHistogramWithMaximalNumberOfBars(value)
+
+	}
+
+}
+
+func (this *StatAggregator) AddDataToHistogramWithMaximalNumberOfBars(value float64) {
+}
+
+func (this *StatAggregator) AddDataToHistogramWhenLessDataThanBarAreOnHistograms(value float64) {
+	for i, v := range this.histogram {
+		if math.Abs(value-v) < epsilon {
+			this.histogramValues[i]++
+			return
+		} else if value < v {
+			this.histogram = append(this.histogram, 0)
+			copy(this.histogram[i+1:], this.histogram[i:])
+			this.histogram[i] = value
+
+			this.histogramValues = append(this.histogramValues, 0)
+			copy(this.histogramValues[i+1:], this.histogramValues[i:])
+			this.histogramValues[i] = 1
+			return
+		}
+	}
+	this.histogramValues = append(this.histogramValues, 1)
+	this.histogram = append(this.histogram, value)
+}