This: plot(match(mydf$let, letters), mydf$num)
:-) On Mar 17, 2016, at 6:48 AM, PIKAL Petr <[email protected]> wrote: > Hi > > It would be easier if mydf$let was factor > > plot(as.numeric(factor(mydf$let)), mydf$num, xaxt="n") > axis(1, at=1:3, levels(factor(mydf$let))) > > Cheers > Petr > > >> -----Original Message----- >> From: R-help [mailto:[email protected]] On Behalf Of Ivan >> Calandra >> Sent: Thursday, March 17, 2016 11:30 AM >> To: R list >> Cc: Anne CANER >> 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 >> [email protected] >> -- >> https://www.researchgate.net/profile/Ivan_Calandra >> https://publons.com/author/705639/ >> >> ______________________________________________ >> [email protected] 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. > > ________________________________ > Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou > určeny pouze jeho adresátům. > Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně > jeho odesílatele. 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