c# - why subtract 0.5 and then *2 in that code......by JAKEDREW(http://www.jakemdrew.com/blog/RgbProjector.htm -


http://www.jakemdrew.com/blog/rgbprojector.htm

private static double calculateprojectionsimilarity(double[] source, double[] compare) {     if (source.length != compare.length)     {         throw new argumentexception();     }      var frequencies = new dictionary();      ////calculate frequencies     (var = 0; < source.length; i++)     {         var difference = source[i] - compare[i];         difference = math.round(difference, 2);         difference = math.abs(difference);         if (frequencies.containskey(difference))         {             frequencies[difference] = frequencies[difference] + 1;         }         else         {             frequencies.add(difference, 1);         }     }      var deviation = frequencies.sum(value => (value.key * value.value));      ////calculate "weighted mean"     ////http://en.wikipedia.org/wiki/weighted_mean     deviation /= source.length;      ////maximize scale     deviation = (0.5 - deviation) * 2;      return deviation; }


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