And let me add the generalized solution - if you don't have just single letters in the column:
plot(match(mydf$let, names(table(mydf$let))), mydf$num) Cheers, Boris On Mar 17, 2016, at 8:45 AM, Boris Steipe <[email protected]> wrote: > This: > > plot(match(mydf$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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