Dear helpful compatriots, I want to write a table with 1) probe names 2) probe indices or x,y coordinates and 3) pm intensities. I used: > names <- probeNames(data) > pms <- pm(data) > pm.i <- indexProbes(data,which="pm") which seems to have given me the all the data I need, but when I try and add them to a data frame or use write.table, I get an error: > data.frame(names,pms,pm.i) Error in data.frame("1116_at" = as.integer(c(167985, 156395, 417100, 287306, : arguments imply differing number of rows: 16, 11, 8, 9, 10, 20, 69 The same error, when trying to write the indices by themselves: > write.table(pm.i,file="pmi.txt") Error in data.frame("1116_at" = as.integer(c(167985, 156395, 417100, 287306, : arguments imply differing number of rows: 16, 11, 8, 9, 10, 20, 69 I only get this error when trying to include indices. I need the indices so that I can match my BioC output up with BLAST info that is based on x,y coordinates. If there is a way to write the x,y coordinates directly instead of the indices, that would save me the conversion. Thank you as always, Tom Turner