static double[] normalizeDoubles(double[] l) {
  ret normalizeDoubles(l, 1);
}

static double[] normalizeDoubles(double[] l, double targetMax) {
  double factor = normalizationFactor(l, targetMax);
  if (factor == 1) ret l;
  int n = l(l);
  double[] x = new[n];
  for i to n:
    x[i] = l[i]*factor;
  ret x;
}