Normalization issue in Java - Android Studio -

i gathering 10 acceleration values on-board accelerometer on mobile device. attempting normalize these values between range of -1,1. unable figure out why isn't working correctly.

here normalization code:

class normutil {  private double datahigh; private double datalow; private double normalizedhigh; private double normalizedlow;   public normutil(double datahigh, double datalow) {      this(datahigh, datalow, 1, -1);  }   public normutil(double datahigh, double datalow, double normalizedhigh, double normalizedlow) {     this.datahigh = datahigh;     this.datalow = datalow;     this.normalizedhigh = normalizedhigh;     this.normalizedlow = normalizedlow; }  public double normalize(double e) {     return ((e - datalow)                     / (datahigh - datalow))                     * (normalizedhigh - normalizedlow) + normalizedlow; } 

on button press, highest/lowest acceleration values found in code:

            = enrolacc.get(0);             b = enrolacc.get(0);             (float i: enrolacc) {                 if(i < a) = i;                 if(i > b) b = i;             } 

once highest/lowest values found normutil instance created , instance used normalize array of acceleration values , add normalized values new array:

            normutil norm = new normutil(b,a,1,-1);              for(int j = 0; j < enrolacc.size(); j++) {                 double start = enrolacc.get(j);                 double x = norm.normalize(start);                 nacc[j] = x;             } 

this nacc array put string array , single string display in text view. issue text view initialized original non-normalized acceleration values, here code use that:

            string normd[] = new string[10];             (int = 0; < 10; i++) {                 normd[i] = string.valueof(nacc[i]);             }              stringbuilder strbuilder2 = new stringbuilder();             (int = 0; i<normd.length; i++) {                 strbuilder2.append(normd[i] + ",");             }             normdata = strbuilder.tostring();              textnorm.settext("normalised: " + normdata); 

so question is, going wrong adding normalized values normalized array , normalization method correct trying achieve? in advance.