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By: a guest on May 28th, 2012  |  syntax: None  |  size: 0.93 KB  |  hits: 14  |  expires: Never
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  1. How do I select a sample of rows at random with repetition from a matrix in R?
  2. X[sample(nrow(X),size=5,replace=TRUE),]
  3.        
  4. X[sample(nrow(X),size=5,replace=FALSE),]
  5.        
  6. x <- matrix(1:1000, nrow=100)
  7.        
  8. x[sample(1:100, 5, replace=TRUE), ]
  9.      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
  10. [1,]   19  119  219  319  419  519  619  719  819   919
  11. [2,]   51  151  251  351  451  551  651  751  851   951
  12. [3,]   42  142  242  342  442  542  642  742  842   942
  13. [4,]   48  148  248  348  448  548  648  748  848   948
  14. [5,]   73  173  273  373  473  573  673  773  873   973
  15.        
  16. x[sample(1:100, 5, replace=FALSE), ]
  17.      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
  18. [1,]   64  164  264  364  464  564  664  764  864   964
  19. [2,]   67  167  267  367  467  567  667  767  867   967
  20. [3,]   20  120  220  320  420  520  620  720  820   920
  21. [4,]   17  117  217  317  417  517  617  717  817   917
  22. [5,]    6  106  206  306  406  506  606  706  806   906
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