static float[] normalizeFloats(float[] l) {
  ret normalizeFloats(l, 1f);
}

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