Another approach using ggplot2 and shamelessly swiped from http://www.sthda.com/english/wiki/ggplot2-dot-plot-quick-start-guide-r-software-and-data-visualization.
library(ggplot2) ggplot(mydf, aes(x=let, y=num)) + geom_dotplot(binaxis='y', stackdir='center', dotsize = 0.5) John Kane Kingston ON Canada > -----Original Message----- > From: ivan.calan...@univ-reims.fr > Sent: Thu, 17 Mar 2016 11:29:52 +0100 > To: r-help@r-project.org > Subject: [R] plot numeric vs character > > Dear useRs, > > I would like to plot data points in a simple scatterplot. I don't have a > lot of data per category, so a boxplot does not make sense. > > Here are some sample data: > mydf <- data.frame(let=rep(letters[1:3],each=3), num=rnorm(9), > stringsAsFactors=FALSE) > > I would like to do that, which throws an error, most likely because x is > character: > plot(mydf$let, mydf$num) > > If I convert to factor(), it plots a boxplot with no possibility (AFAIK) > to plot points: > mydf$let <- factor(mydf$let) > plot(mydf$let, mydf$num, type='p') > > I know I can use the function points() in a somewhat convoluted manner: > plot(mydf$num, xlim=c(1,3), type='n', xaxt='n') > axis(side=1, at=1:3, labels=levels(mydf$let)) > points(as.numeric(mydf$let), mydf$num) > > Isn't there a simple(r) way? Maybe I just missed something obvious... > > Thank you in advance for your help, > Ivan > > -- > Ivan Calandra, PhD > University of Reims Champagne-Ardenne > GEGENAA - EA 3795 > CREA - 2 esplanade Roland Garros > 51100 Reims, France > +33(0)3 26 77 36 89 > ivan.calan...@univ-reims.fr > -- > https://www.researchgate.net/profile/Ivan_Calandra > https://publons.com/author/705639/ > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. ____________________________________________________________ Can't remember your password? Do you need a strong and secure password? Use Password manager! It stores your passwords & protects your account. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.