Hi Anne, try xx <- as.matrix(exprs(B)) xx[1:5,1:5] greetings sylvia > ------------------------------ > > Message: 4 > Date: Fri, 1 Aug 2003 15:16:13 -0700 > From: "Anne Sauve" <asauve@gladstone.ucsf.edu> > Subject: [BioC] how to convert expression set data into matrix data ? > > To: <bioconductor@stat.math.ethz.ch> > Message-ID: <003501c3587a$857cd130$8502280a@GCORE15> > Content-Type: text/plain; charset="us-ascii" > > Hello, > > I am trying to convert some expression set data into a matrix format > in order to do computations on them. > > The way I do it now is in 3 steps: > > write.exprs(B[,14],file="B.txt") > B = read.table("B.txt") > Bmat = as.matrix(Bmat) > > where B is an expression set with 15 samples and 12626 genes. > > Is there a more direct way of doing that conversion ? > > Thanks for your help, > > Anne >