Gilles Sadowski created NUMBERS-215:
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Summary: Stirling partitions generator
Key: NUMBERS-215
URL: https://issues.apache.org/jira/browse/NUMBERS-215
Project: Commons Numbers
Issue Type: New Feature
Components: combinatorics
Reporter: Gilles Sadowski
Assignee: Gilles Sadowski
Fix For: 1.4
Would it be useful to provide functionality to *iterate* over the partitions
defined by "Stirling number of the second kind" (i.e. all partitions into K
subsets, of a set of N elements)?
Code would be in a nested static class of the existing
[{{Stirling}}|https://commons.apache.org/proper/commons-numbers/commons-numbers-combinatorics/apidocs/src-html/org/apache/commons/numbers/combinatorics/Stirling.html]
class:
{code}
public final class Stirling {
// ...
public static final class S2 implements Iterable<List<List<Integer>> {
// ...
public static S2 of(int n, int k) {
// ...
}
}
}
{code}
I have a potential use case (for very small "N").
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