converting affybatch object to matrix

I have an Affybatch object called "batch" :
batch
AffyBatch object
size of arrays=1050x1050 features (196 kb)
cdf=HuGene-1_0-st-v1 (32321 affyids)
number of samples=384
number of genes=32321
annotation=hugene10stv1
notes=

Is there a way of converting a portion of this data into a matrix? More specifically, a matrix where the 384 samples are columns and the 32321 genes are rows? The "exprs" function returns a matrix that has 384 columns but for some reason there are 1050^2 rows.

Thanks!
Use exprs on the output from RMA (or another method you like)

library("affy")
myData <-ReadAffy()
myRMA <- rma(myData)
e = exprs(myRMA)

Also, check out the  Bioconductor mailing list where
Bioconductor-related topics are discussed.

On Fri, Apr 1, 2011 at 9:54 AM, Landes, Ezekiel
I have an Affybatch object called "batch" :

batch
AffyBatch object
size of arrays=1050x1050 features (196 kb)
cdf=HuGene-1_0-st-v1 (32321 affyids)
number of samples=384
number of genes=32321
annotation=hugene10stv1
notes=

Is there a way of converting a portion of this data into a matrix? More specifically, a matrix where the 384 samples are columns and the 32321 genes are rows? The "exprs" function returns a matrix that has 384 columns but for some reason there are 1050^2 rows.

Thanks!
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