Hello,

I am wondering how to remove duplicate probes from an expression set in Bioconductor.  I have tried to use nsFilter with no success.

When I use the following:

featureFilter(xenexp, require.entrez=TRUE, remove.dupEntrez=TRUE)

The error I get is:

Error in rowQ(exprs(imat), which) : 
  cannot calculate order statistic on object with 2 columns

 The xenexp expression set includes two samples on the mgu74av2 array

Thank you so much,

Angela
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