Dear All, Dear Christian,

I've used XPS quite extensively to process/analyse human Exon arrays.
I would like to make some quality control measures on a single CEL file but
I'm running into trouble at the background computation/correction step:
apparently the "bgcorrect.rma" does not allow to process one sample at a
time.
Here is my function call (integrated in a pipeline):
data.bg.rma <- bgcorrect.rma(root.data, root.filename, filedir=root.path,
update=TRUE, select="antigenomic", exonlevel="all", verbose=TRUE)

Here is the output (error):
Opening file </Data2/thomas/QC.reporting/ROOT_files/singleCEL.root> in
<READ> mode...
Opening file </Data2/thomas/QC.reporting/ROOT_files/singleCEL.root> in
<UPDATE> mode...
Opening file </Data2/thomas/QC.reporting/ROOT_files/data_singleCEL.root> in
<READ> mode...
Opening file </Data2/thomas/QC.reporting/ROOT_files/data_singleCEL.root> in
<READ> mode...
Error: At least two trees need to be selected.
Error in .local(object, ...) : error in rwrapper function ‘BgCorrect’

Is there any way to get around that problem?

Thanks in advance.

Cheers,

Thomas

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