[R] Permutations

[Jordi Altirriba Gutiérrez]

Dear R users,
I’m a beginner user of R and I’ve a problem with permutations that I don’t 
know how to solve. I’ve 12 elements in blocks of 3 elements and I want only 
to make permutations inter-blocks (no intra-blocks) (sorry if the 
terminology is not accurate), something similar to:

1 2 3 | 4 5 6 | 7 8 9 | 10 11 12   ----------1st permutation

1 3 2 | 4 5 6 | 7 8 9 | 10 11 12   NO
   -  -
3 2 1 | 4 5 6 | 7 8 9 | 10 11 12   NO
-  -  -
1 2 4 | 3 5 6 | 7 8 9 | 10 11 12   YES-----2nd permutation
      -    -
4 5 6 | 1 2 3 | 7 8 9 | 10 11 12   YES-----3rd permutation
-  -  -   -  -  -
4 5 6 | 2 1 3 | 7 8 9 | 10 11 12   NO
           -  -
....

  Thanks for your time,

Jordi Altirriba
Ph D student

Hospital Clinic - Barcelona - Spain


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