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Scaling Values into a range between 0 and 1

/ Published in: Java
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You have to use float or double for the returned value, since the scale occurs in a continuous function.

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  1. public double[] scaleValues(double[] vals) {
  2.         double[] result = new double[vals.length];
  3.         double min = minArray(vals);
  4.         double max = maxArray(vals);
  5.         double scaleFactor = max - min;
  6.         // scaling between [0..1] for starters. Will generalize later.
  7.         for (int x = 0; x < vals.length; x++) {
  8.             result[x] = ((vals[x] - min) / scaleFactor);
  9.         }
  10.         return result;
  11.     }
  12.  
  13.     // The standard collection classes don't have array min and max.
  14.     public double minArray(double[] vals) {
  15.         double min = vals[0];
  16.         for (int x = 1; x < vals.length; x++) {
  17.             if (vals[x] < min) {
  18.                 min = vals[x];
  19.             }
  20.         }
  21.         return min;
  22.     }
  23.  
  24.     public double maxArray(double[] vals) {
  25.         double max = vals[0];
  26.         for (int x = 1; x < vals.length; x++) {
  27.             if (vals[x] > max) {
  28.                 max = vals[x];
  29.             }
  30.         }
  31.         return max;
  32.     }

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