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=mea n) 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]]

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=m ean) 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]] > > _______________________________________________ > Bioconductor mailing list > Bioconductor at r-project.org > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor -- Computational Biology Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: M1-B861 Telephone: 206 667-2793