[R] Help, how to find the genes with A<19?

arun smartpink111 at yahoo.com
Sat May 4 17:43:33 CEST 2013

If it is to get the first 18 genes (based on rownumbers)
dat1<- read.table("apcall.txt",header=TRUE,sep="",stringsAsFactors=FALSE)


>The row numbers represent 7129 different genes 
>The 38 columns represent 38 different patients 
>How can I find the genes with A number < 19 in these 7129 genes? 
>I have searched and tried for 7 hours but still can not find the way to solve 

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