First of all, thanks for the incredibly fast answers and help of Rolf, Marc and Robert.
Yes, I noticed that it was a lot of permutacions, but my intention was to make this process automatic and take only 5.000 - 10.000 permutations. Therefore, I wanted only to take that "interesting permutations" with "some information" [inter-block permutations].
The reason why I'm interested in these permutations is because I'm using some packages of Bioconductor to analyse my data from some microarrays and I thought that perhaps could be interesting to see what happens when I permute my data and I compare it against the not permuted data.
Thanks again for your time and suggestions.
Jordi Altirriba Ph. D. Student
Hospital Clinic-Barcelona-Spain
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