Hi I am not an expert but it probably results from covenience plot.factor method which calls boxplot when used for or factor data.
See graphics:::plot.factor graphics:::boxplot.default I belive that you can do something with ggplot like (untested) p <-ggplot(mydf, aes(x=let, y=num)) p+geom_point() p+geom_jitter() or change plot.factor method, which is beyound my level. I considered dotchart but it is used for differnt data structure. Cheers Petr > -----Original Message----- > From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Ivan > Calandra > Sent: Thursday, March 17, 2016 12:01 PM > To: R list > Cc: Anne CANER > Subject: Re: [R] plot numeric vs character > > Thanks Petr, > > You're right, no need for points(). > But is there an even simpler way? I still find it strange that plot() > does not allow points to be plotted instead of boxplots when x is a > factor (because boxplots do not always make sense). Is there a good > reason for that? > > 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/ > > Le 17/03/2016 11:48, PIKAL Petr a écrit : > > 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:r-help-boun...@r-project.org] 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 > >> ivan.calan...@univ-reims.fr > >> -- > >> ________________________________ 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. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému. Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat. Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu. 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