On 11/23/2011 02:01 PM, sarah44 wrote:
Dear all,
I am currently working on a function in which I would like to avoid using
the command sample().
Therefore, I am now trying to make a for loop that does the same thing as
the in built function sample
does: Rearranging the items of a object randomly.
So, the output I want to you get is the same as sample() would give me:
e.g.:
data<- c(5,4,6,7,8)
sample(data)
data<- c(5,4,6,7,8)
sample(data)
[1] 4 6 7 8 5
sample(data)
[1] 6 8 4 7 5
sample(data)
[1] 6 5 4 8 7
Herefore I made a for loop which you can see here:
This for loop is supposed to do the same as the sample() function, 3 times.
data<- c(5,4,6,7,8)
numsim<- 3
n<- length(data)
sample<- matrix(0,numsim,1)
for (i in 1:numsim) {indices<- runif(pool, min = 1, max = n)
sample[i,]<- data[indices]
}
the idea behind this for loop is dat it first creates randomly data by
runif, and then it should
somehow, by using indeces, store this 3 times in a matrix 'sample'.
Somehow, I am stuck here and I think that the sample[,i] part is just very
wrong. I am however
not for a very long time an R user, so I cannot find the solution to this
problem.
Can someone give me a hint?
Thanks very much!
Bye, sarah
The only reason I can think of you wanting to avoid sample() is because
this is homework and the list is not for homework. If I have misjudged
the intent of your post, please forgive me.
--
Kevin E. Thorpe
Biostatistician/Trialist, Applied Health Research Centre (AHRC)
Li Ka Shing Knowledge Institute of St. Michael's
Assistant Professor, Dalla Lana School of Public Health
University of Toronto
email: kevin.tho...@utoronto.ca Tel: 416.864.5776 Fax: 416.864.3016
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