Hello R users,
I have gene expression data of two groups of genes (large and small). Gene
expression intensities of those genes are classified into 1 to 10 levels. What
I want is to make a random set of genes that have the same levels as the small
group from large group using sample().
I used smallvec to hold the number of genes in each levels (1 to 10) for small
group, largevec for large group. I ordered the gene expression data frame of
large group (largedf) by the levels and randomly chose the genes with same
level as small group. Using the code below I can get the random set of genes
from 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
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