Hi all,

When I analyse my microarray data, I used "aggregate" to calculate the mean
of the probes that have the same gene symbols. Following is the code that I
use:

data.lumi.aggre<-aggregate(data.lumi,by=list(data.lumi$SYMBOL),FUN=mean)

I think that "aggregate" function gives unique gene symbols; however in my
results, multiple rows have the same gene symbols. I wonder if anybody
encountered the same problem. Is this a bug in R? How could I solve it?

Thank you,
Wendy

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