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Hi D, Try this: T <- rep(c(rep(1, nrow(M)), rep(-1, nrow(M))), ncol(M)/2) Ana ---- Mensaje Original ---- De: spam56 at gto.net Para: bioconductor at stat.math.ethz.ch Asunto: RE: [BioC] Multiply dye-swaps Fecha: Thu, 6 Sep 2007 12:41:30 -0400 >Hi all, > >I have a simple problem that I can't seem to figure out. I have my >normalized log-ratios (M) in an array, however there are dye-swaps >throughout. I would like to export the data to a table to manipulate >outside of R, but would like to first correct the M values for the >dye >swaps. I realize I have to multiply the dye-swap columns by -1, but >I'm and >R newbie and can't come up with a some simple R code to do this. >There are >28 slides in the data set. I've tried this, which seemed to make >sense to >me, but doesn't give the result I expect: > >T<-c(-1,1,-1,1,-1,1,-1,1,-1,1,1,-1,1,-1,1,-1,1,-1,1,-1,1,-1,-1,1,-1,1 >,-1,1) >M.cor<-T*M > >#where M is the matrix of M values. > >Can anybody with more R experience than I have help me? > >Thanks, > >D > > [[alternative HTML version deleted]] > >_______________________________________________ >Bioconductor mailing list >Bioconductor at stat.math.ethz.ch >https://stat.ethz.ch/mailman/listinfo/bioconductor >Search the archives: http://news.gmane.org/gmane.science.biology.info >rmatics.conductor