> On 15 Oct 2015, at 16:28, Stephen Colebourne <scolebou...@joda.org> wrote:
>
> I've been working on a Java 8 wrapper class around double[] in my day
> job, and added the following factory method:
>
> /**
> * Obtains an instance with entries filled using a function.
> * <p>
> * The function is passed the array index and returns the value for
> that index.
> *
> * @param size the number of elements
> * @param valueFunction the function used to populate the value
> * @return an array initialized using the function
> */
> public static DoubleMatrix1D of(int size, IntToDoubleFunction valueFunction)
> {
> if (size == 0) {
> return EMPTY;
> }
> double[] array = new double[size];
> for (int i = 0; i < array.length; i++) {
> array[i] = valueFunction.applyAsDouble(i);
> }
> return new DoubleMatrix1D(array);
> }
>
Within that method you can use Arrays.setAll(array, valueFunction). In
hindsight it would have been useful for that method to return the filled array.
Paul.
