Hello, Experts, I have obtained single probe-level data from affybatch object (mydata)using the script: library(affy) mydata<-ReadAffy() mypm<-pm(mydata) mymm<-mm(mydata) myaffyids<-probeNames(mydata) probedata<-data.frame(myaffyids, mypm, mymm) Now I want to retrieve the genomic positions and/or orders of probes in each probe set listed by myaffyids and add them to data frame( probedata). Could you please help me out? Thank you in advance! Joshua

Have you looked at the useProbeInfo vignette in the annotate package? szhan at uoguelph.ca wrote: > Hello, Experts, > I have obtained single probe-level data from affybatch object (mydata)using the > script: > library(affy) > mydata<-ReadAffy() > mypm<-pm(mydata) > mymm<-mm(mydata) > myaffyids<-probeNames(mydata) > probedata<-data.frame(myaffyids, mypm, mymm) > Now I want to retrieve the genomic positions and/or orders of probes in each > probe set listed by myaffyids and add them to data frame( probedata). > Could you please help me out? > Thank you in advance! > Joshua > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > -- Robert Gentleman, PhD Program in Computational Biology Division of Public Health Sciences Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N, M2-B876 PO Box 19024 Seattle, Washington 98109-1024 206-667-7700 rgentlem at fhcrc.org