See comments below. On Wed, 2004-08-18 at 22:06, S Peri wrote: > Hi group, > I am trying to get the LocusID numbers from my affy > expression matrix. > > I instantiated rownames function to get an object with > all the probe IDs. > > > where.affy.at <- rownames(gliexp) > > Now I wanted to get another object with the LocusIDs > in it like the following. However, I get the > following error. How come i = i +1 is not considered > as incrementation here. I know there is some trouble > in defining. I come from Python background so I am > stuck. Could any one help me please. > > > >for (i in where.affy.at){ ^^^^^^^^^^^^^^^^ Here i is the _name_ of the each id which is a character mode. For example i = "100_g_at". > + gene.locusid.affy <- get(i,env= hgu95av2LOCUSID) > + i = i + 1 Here you are trying to do i = "100_g_at" + 1 which does not make sense and hence the error I do not know python but I presume it might give some sort of error when you try to add a numeric to character as opposed to perl which quietly converts the character to 0 and adds 1 ? In future, try putting a print(i) or something similar after every line to narrow down where the problem is. This is a not very clever way of debugging but it is simple. > + gene.locusid.affy > + } > Error in i + 1 : non-numeric argument to binary > operator > > > Thank you. > PS > > _______________________________________________ > Bioconductor mailing list > Bioconductor@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor >