[R] plot numeric vs character

[PIKAL Petr]

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-bounces at 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.calandra at 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-bounces at 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.calandra at univ-reims.fr
> >> --
> >>

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