public static double[] toArray(Sequence s, int from, int to) throws UndefinedElementException {

        double[] outputArray = new double[(to - from)];
        int position = from;
        double makeIntTemp1;
        int makeIntTemp2;
        for (int i = 0; i < (to - from); i++) {//invariant: from <= i <= (to-from)
            try {
                //round to 2 decimal places
                makeIntTemp1 = s.getElementAtIndex(position) * 100;
                makeIntTemp2 = (int) makeIntTemp1;
                outputArray[i] = (double) (makeIntTemp2 / 100.0);

                //outputArray[i] = s.getElementAtIndex(position); //test without rounding

                position++;
            } catch (UndefinedElementException e) {
                outputArray[i] = Double.NaN;
            }
        }
        return outputArray;
    }