static int[] iroundDoubleArray(double[] a, int start, int end) {
  int[] b = new[end-start];
  for (int i = start; i < end; i++)
    b[i-start] = iround(a[i]);
  ret b;
}

static int[] iroundDoubleArray(double[] a) {
  ret a == null ?: iroundDoubleArray(a, 0, a.length);
}