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/**
* Example for arrays of primitive types, etc. double
*/
public double[] listToArrayDouble(ArrayList<Double> list) {
    double[] array = new double[list.size()];
    for (int i = 0; i < array.length; i++) {
        array[i] = list.get(i);
    }
return array;
}
 
/* Example for arrays of reference types, etc. Double */
Double[] array = list.toArray(new Double[list.size()]);