[R] how to randomize a vector

Frede Aakmann Tøgersen FredeA.Togersen at agrsci.dk
Mon Nov 12 08:29:27 CET 2007

Why didn't you do this in R?

> help.search("random sample")
Help files with alias or concept or title matching 'random sample'
using fuzzy matching:

sample(base)            Random Samples and Permutations

Type 'help(FOO, package = PKG)' to inspect entry 'FOO(PKG) TITLE'.

See ?sample, e.g.

> t1 <- rnorm(70000)
> system.time(t2 <- sample(t1,size=length(t1)))
   user  system elapsed 
   0.01    0.00    0.01 

Best regards

Frede Aakmann Tøgersen

Faculty of Agricultural Sciences
Dept. of Genetics and Biotechnology
Blichers Allé 20, P.O. BOX 50
DK-8830 Tjele

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E-mail:  FredeA.Togersen at agrsci.dk
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> -----Oprindelig meddelelse-----
> Fra: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] På vegne af leffgh
> Sendt: 12. november 2007 07:50
> Til: r-help at r-project.org
> Emne: [R] how to randomize a vector
> I have a vector whose length is nearly 70 thousand.
> I need randomize it for 1000 times .
> for randomizing , I mean ,the elements of the vector remain 
> intact while their order in the vector get changed randomly.
> I have written a function which seems to be able to solve 
> short vectors , but waste  a lot of time when dealing with 
> the the long vector mentioned above.
> --
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