[BioC] exonmap RMA function

[James W. MacDonald]

Hi Yuan,

Jay an wrote:
> Hello,
>   I got several .CEL files to do RMA using exonmap library below:
>   > raw.data <- read.exon()
>> raw.data at cdfName <- "exon.pmcdf"
>> x.rma <- rma(raw.data)
>> write.table(x.rma, file="x.csv", sep="\t")

I'm surprised that worked. If you want to write out the expression 
values you want to use write.exprs(), not write.table(), which is 
intended to write out data.frames or matrices (and x.rma is neither).

Best,

Jim


>    the file x.csv has 1,411,190 conlumns titles "x231501" "X2315102"....
>   can you please tell me what the meaning of columns? are they
>   expression levels for all probesets?
>   how can i get RMA expression level for each probe?
>    
>    
>   thanks
>   Yuan
>    
>    
> 
>        
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-- 
James W. MacDonald, M.S.
Biostatistician
Affymetrix and cDNA Microarray Core
University of Michigan Cancer Center
1500 E. Medical Center Drive
7410 CCGC
Ann Arbor MI 48109
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