Hi Vincent,
I used the Mouse Genome 430 2.0 Array (
http://www.affymetrix.com/support/technical/byproduct.affx?product=moe430-20
)

Here is my session info:
R version 2.11.1 (2010-05-31)
i386-apple-darwin9.8.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] mouse4302cdf_2.6.0 simpleaffy_2.24.0  gcrma_2.20.0
genefilter_1.30.0  affy_1.26.1        Biobase_2.8.0

loaded via a namespace (and not attached):
 [1] affyio_1.16.0         annotate_1.26.1       AnnotationDbi_1.10.2
Biostrings_2.16.9     DBI_0.2-5             IRanges_1.6.17
preprocessCore_1.10.0
 [8] RSQLite_0.9-2         splines_2.11.1        survival_2.35-8
tools_2.11.1          xtable_1.5-6

Thanks in advance for your help.
Anjan


On Wed, Oct 6, 2010 at 9:36 PM, Vincent Carey <stvjc@channing.harvard.edu>wrote:

> please provide your sessionInfo() and the specific class of array in
> use -- there are various mouse
> expression arrays from affy.
>
> On Wed, Oct 6, 2010 at 9:17 PM, ANJAN PURKAYASTHA
> <anjan.purkayastha@gmail.com> wrote:
> > Hi,
> > I have created an affybatch object from 3 cel files. The files have data
> > from Affymetrix's Mouse Expression (Oligonucleotide) array.
> > Affybatch object was created by command:
> > testAffy <- ReadAffy()
> >
> > In the next step I tried to use expresso to adjust background using RMA
> and
> > normalize using loess, using the command:
> > testAffy.loess = expresso(testAffy, bgcorrect.method= "rma",
> > normalize.method= "loess")
> > Here is the output:
> > background correction: rma
> > normalization: loess
> > PM/MM correction :
> > expression values:
> > background correcting...done.
> > normalizing...Done with 1 vs 2 in iteration 1
> > Done with 1 vs 3 in iteration 1
> > Done with 2 vs 3 in iteration 1
> > 1 0.0176947
> > done.
> > Error in function (classes, fdef, mtable)  :
> >  unable to find an inherited method for function "computeExprSet", for
> > signature "AffyBatch", "NULL", "NULL"
> >
> > The testAffy.loess object was not created.  Any idea why I am getting an
> > error on running the expresso command?
> > Thanks in advance.
> > Anjan
> >
> > --
> > ===================================
> > anjan purkayastha, phd.
> > research associate
> > fas center for systems biology,
> > harvard university
> > 52 oxford street
> > cambridge ma 02138
> > phone-703.740.6939
> > ===================================
> >
> >        [[alternative HTML version deleted]]
> >
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> >
>



-- 
===================================
anjan purkayastha, phd.
research associate
fas center for systems biology,
harvard university
52 oxford street
cambridge ma 02138
phone-703.740.6939
===================================

	[[alternative HTML version deleted]]

