Convert your column to numeric: CEM1_PARTIAL$V3 <- as.numeric(as.character(CEM1_PARTIAL$V3))
On Mon, Dec 27, 2010 at 4:28 PM, R_novice <kaso...@battelle.org> wrote: > > Thank you for the quick response :-). I've applied your suggestion to my > code, but I still receive an error: > > > CEM1_PARTIAL$V3[which(CEM1_PARTIAL$V4 == "DOWN") - 1] <- > > CEM1_PARTIAL$V3[which(CEM1_PARTIAL$V4 == "DOWN") - 1] * -1 > Warning message: > In Ops.factor(CEM1_PARTIAL$V3[which(CEM1_PARTIAL$V4 == "DOWN") - : > * not meaningful for factors > > I would like to perform this evaluation in a loop b/c my data matrix > actually contains 109 columns, and 32,000 rows. > > More suggestions are appreciated! > > Thanks! > -- > View this message in context: > http://r.789695.n4.nabble.com/matrix-looping-accessing-previous-column-tp3165308p3165325.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
