gistfile1.rb

def test_n_fold_validation
     data = []
     data << [4,3,1] << [1,1,3] << [5,2,1] << [6,9,7] << [9,8,9] << [7,3,5] << [11,4,2] << [12,1,8] <<  [3,8,6]
     number_of_folds = 4     
     folds = []
     folds << BrilliantRuby::ML.n_fold_validation(number_of_folds, data)
     assert(folds.length == 4,  "Unexpected number of folds created")
end

----------------------------
 def self.n_fold_validation(n_folds, data)
    #create bins
    p data
..
output:

3
1
1
1
3
5
2
1
6
9
7
9
8
9
7
3
5
11
4
2
12
1
8
3
8
6
4
3
1
1
1
3
5
2
1
6
9
7
9
8
9
7
3
5
11
4
2
12
1
8
3
8
6
4
3
1
1
1
3
5
2
1
6
9
7
9
8
9
7
3
5
11
4
2
12
1
8
3
8
6
4
3
1
1
1
3
5
2
1
6
9
7
9
8
7
3
5
11
4
2
12
1
8
6