On 7/22/13 12:19 PM, Gilles wrote:
> On Sun, 21 Jul 2013 20:40:42 -0700, Phil Steitz wrote:
>> I would like to use getNatural and shuffle from RandomDataGenerator
>> outside of that class (inside [math] I need to efficiently generate
>> random n-m partitions of {0, ..., n + m - 1}). I think getNatural
>> could go into MathArrays and shuffle could just be exposed by
>> RandomDataGenerator. Any objections to making these public? (I
>> promise to rewrite the javadoc for getNatural so it makes sense to
>> non-logicians and I would even be OK with renaming it ;)
>
> "shuffle" could probably be useful in other contexts too. Various
> versions could also be defined in "MathArrays":
>
> ---CUT---
> public enum Position {
> /** Designates the beginning of the array (near index 0). */
> HEAD,
> /** Designates the end of the array. */
> TAIL
> }
>
> public static void shuffle(int[] list,
> int start,
> Position pos,
> RandomGenerator rng) {
> // ...
> }
> ---CUT---
>
> And "double" versions:
>
> ---CUT---
> public static void shuffle(double[] list,
> int start,
> Position pos,
> RandomGenerator rng) {
> // ...
> }
> ---CUT---
>
> And obvious overloads: e.g.
>
> ---CUT---
> public static void shuffle(double[] list, RandomGenerator rng)
> public static void shuffle(double[] list)
> ---CUT---
>
>
> The method in RandomDataGenerator would become a client:
>
> ---CUT---
> private void shuffle(int[] list, int end) {
> MathArrays.shuffle(list, MathArrays.Position.TAIL, end,
> getRandomGenerator());
> }
> ---CUT---
+1
All that I need immediately is the int[] version that shuffles the
entire array, but I agree that the above could prove useful and are
natural.
Phil
>
>
> Regards,
> Gilles
>
>
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