You can randomize the order (permute) of a single column with something
like:
> x <- cbind( x=1:10, y=101:110, z=201:210 )
> rownames(x) <- letters[1:10]
> new.x <- x
> new.x[,1] <- sample(new.x[,1])
> new.x
x y z
a 8 101 201
b 10 102 202
c 5 103 203
d 9 104 204
e 3 105 205
f 1 106 206
On Wed, Apr 09, 2008 at 11:08:28AM -0700, Grant Gillis wrote:
> I would like to randomize data within columns.
I think the following line does what you want (minus preserving the row
labels):
apply(data, 2, sample)
Maybe someone smarter than me knows how to preserve the row names. I
would proba
Grant Gillis wrote:
> 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(dat
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