Dear useRs, 

I am looking into the raw data of the 500K SNP arrays and I would like to
select the data from only one strand, sense OR antisense.  How could I do
this?  Probably something like:

     fsetSty <- read.celfiles(dir()[grep("S.CEL", dir())]) 
     strand.sty <- pmStrand(get(annotation(fsetSty))) 

but the last command results in "Error: could not find function "pmStrand"" 
although ?pmStrand is recognised and gives... 
  
Description: 
     Returns the strand information on SNP arrays for PM probes (0 - 
     sense / 1 - antisense). 
Usage: 
     pmStrand(object) 
Arguments: 
  object: 'AffySNPPDInfo' object 
  


Thanks in advance for your help! 
An 


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