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2008 Oct 30
3
why does sample(x, n) give the same n items in every separate runs?
...lagre group with same levels for small group. But I got the same set of genes when I run the code in every other runs in Linux. This gives me a doubt in my result.
smallvec<-c(8,12,9,6,13,20,16,11,8,5) ## the No. of genes in levels 1 to 10
largevec<-c(400,300,550,600,210,420,380,600,450,500)
generdm<-c() ## a random set of genes
for( i in 1:length(smallvec)){
generdm<-c(generdm,sample(rownames(largedf)[sum(largevec[0:(i-1)],1):sum(largevec[0:i])],smallvec[i])) ## rownames(largedf) gives gene names ordered by levels in large group
}
Could you please help me out?
Thanks a lot!!
Josh