static double[] toDoubleArray(Cl<Double> l) {
  double[] a = new double[l(l)];
  int i = 0;
  if (a.length != 0) for (double x : l)
    a[i++] = x;
  ret a;
}

ifclass IntBuffer
static double[] toDoubleArray(IntBuffer b) {
  int n = l(b);
  double[] a = new [n];
  for i to n:
    a[i] = b.get(i);
  ret a;
}
endif