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#2220 closed enhancement (done)

Improve the generation of all possible combinations of values in ValueGenerator.cs

Reported by:	bburlacu	Owned by:	bburlacu
Priority:	low	Milestone:	HeuristicLab 3.3.11
Component:	Problems.Instances	Version:	3.3.10
Keywords:		Cc:

Description

The method GenerateAllCombinationsOfValuesInLists from HeuristicLab.Problems.Instances.DataAnalysis.ValueGenerator.cs seems unnecessarily complicated. The following snippet [1] should achieve the same functionality:

public static IEnumerable<IEnumerable<T>> CartesianProduct<T>(this IEnumerable<IEnumerable<T>> sequences) {
    IEnumerable<IEnumerable<T>> result = new[] { Enumerable.Empty<T>() };
    return sequences.Aggregate(result, (current, s) => (from seq in current from item in s select seq.Concat(new[] { item })));
  }

[1] http://blogs.msdn.com/b/ericlippert/archive/2010/06/28/computing-a-cartesian-product-with-linq.aspx