source: src/main/java/agents/anac/y2013/GAgent/Probability.java

package agents.anac.y2013.GAgent;

public class Probability {
        
        public double mean;
        public double widthUtil;
        public double variance;
        public int itemNum;
        
        private double sumRatio;
        private double sumRatio2;
        
        
        public Probability(double w) {
                sumRatio = 0;
                sumRatio2 = 0;
                mean = 0D;
                widthUtil = w;
                variance = 0D;
                itemNum = 0;
        }
        private void calMean(double ratio){
                sumRatio += ratio;
                mean = sumRatio / itemNum;
        }
        
        private double calVar(double ratio){
                sumRatio2 += ratio * ratio; 
                variance = sumRatio2 / itemNum - mean*mean;
                return variance;
        }
        
        private double getRatio(double util){
                return  util / widthUtil;
        }
        
        public double getM(double diff){
                itemNum++;
                double ra = getRatio(diff);
                calMean(ra);
                return mean;
        }
        public double getVar(double diff){
                itemNum++;
                double ra = getRatio(diff);
                calMean(diff);
                variance = calVar(ra);
                return mean*100000*variance*widthUtil;
        }
        

}