[BioC] "aggregate" function in R give non-unique values

[Martin Morgan]

On 09/07/2011 02:49 PM, Wendy Qiao wrote:
> 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)

Hi Wendy -- can you provide a simple reproducible example that we can 
copy from your email and paste into our R session to replicate the 
problem? Also, can you provide the output of the

    sessionInfo()

command?

Martin

>
> 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
>
> 	[[alternative HTML version deleted]]
>
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