It is useful to have a reproducable example https://github.com/hadley/devtools/wiki/Reproducibility http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example
However is this somethingl like what you want? Note I changed variable names and removed caps to make life easier and renamed the dataset to dat1 (just handier for me). I think "col" as a reserved word should not be used. It seemed to be causing a problem. library(ggplot2) dat1 <- structure(list(aa = 189:194, bb = c(158L, 54272L, 301574L, 161620L, 61263L, 83800L), colmat = c(158L, 54272L, 301574L, 161620L, 61263L, 83800L), fastq = c(158L, 54272L, 301574L, 161620L, 61263L, 83800L ), miseq = c(104L, 32122L, 152625L, 100469L, 38109L, 40095L)), .Names = c("aa", "bb", "colmat", "fastq", "miseq"), class = "data.frame", row.names = c(NA, -6L)) p1 <- ggplot(dat1, aes( as.factor(aa), y = bb, fill = as.factor(aa))) p1 <- p1 + geom_bar(stat = "identity") p1 John Kane Kingston ON Canada > -----Original Message----- > From: jarod...@libero.it > Sent: Wed, 26 Nov 2014 18:04:21 +0100 (CET) > To: r-help@r-project.org > Subject: [R] How to use ggplot2 > > Dear All!! > I'll try to plot a barplot using aggplot2 > > head(alt) > as.factor.data...7.. Col ColMat Fastq miseq > 1 189 158 158 158 104 > 2 190 54272 54272 54272 32122 > 3 191 301574 301574 301574 152625 > 4 192 161620 161620 161620 100469 > 5 193 61263 61263 61263 38109 > 6 194 83800 83800 83800 40095 >> > p<- ggplot(data = alt, aes(y = alt[,2])) + geom_bar() > > Error : Mapping a variable to y and also using stat="bin". > With stat="bin", it will attempt to set the y value to the count of > cases in each group. > This can result in unexpected behavior and will not be allowed in a > future version of ggplot2. > If you want y to represent counts of cases, use stat="bin" and don't > map a variable to y. > If you want y to represent values in the data, use stat="identity". > See ?geom_bar for examples. (Defunct; last used in version 0.9.2) > How can resolve this problem? > My data are in column: each columns are conditions and each row rappresnt > a sample > thanks for your help! > M > > > [[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. ____________________________________________________________ FREE 3D EARTH SCREENSAVER - Watch the Earth right on your desktop! ______________________________________________ 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.