[R] permutation/randomization

From: Grant Gillis <grant.j.gillis_at_gmail.com>
Date: Wed, 09 Apr 2008 11:08:28 -0700


Hello,

I have what I suspect might be an easy problem but I am new to R and stumped. I have a data set that looks something like this

b<-c(2,3,4,5,6,7,8,9)
x<-c(2,3,4,5,6,7,8,9)
y<-c(9,8,7,6,5,4,3,2)
z<-c(9,8,7,6,1,2,3,4)

data<-cbind(x,y,z)
row.names(data)<-c('a','b','c','d','e','f','g','h')

which gives:

 x y z
a 2 9 9
b 3 8 8
c 4 7 7
d 5 6 6
e 6 5 1
f 7 4 2
g 8 3 3
h 9 2 4

I would like to randomize data within columns. The closest I have been able to come permutes data within the columns but keeps rows together along with row names(example below). For some context, eventually I would like use this to generate many data sets and perform calculations on these random data sets (I think I know how to do this but we'll see). So ideally I would like row names to remain the same (in order a through h) and column data to randomize within columns but independently of the other columns. Just shuffle the data deck I guess

> data[permute(1:length(data[,1])),]

  x y z
b 3 8 8
c 4 7 7
h 9 2 4
e 6 5 1
f 7 4 2
a 2 9 9
g 8 3 3
d 5 6 6

Thanks in advance for the help and also for the good advice earlier this week.

Cheers

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