How to breakdown n data into all possible k groups

Hello all,

what I want to do is to break down n data (e.g. 4 for illustration purposes) into all possible 2 groups.

For 1 2 3 4 for example all possible 2 groups are

1 & 2 3 4

2 & 1 3 4

3 & 1 2 4

4 & 1 2 3

1 2 & 3 4

1 3 & 2 4

1 4 & 2 3

I hope you can understand what I mean. Of course order is not an issue in this case.

Regards,

Answer 1

[Guillaume]

A quick google search find this file exchange entry

Answer 2

[Konstantinos Belivanis]

I guess my Google is not as smart as yours...

[Guillaume]

The important keyword is partition.