[R] barplots and missing xlabels

[Geoff Russell]

See below

On 1/14/08, Jim Lemon <jim at bitwrit.com.au> wrote:
> Geoff Russell wrote:
> > Dear useRs,
> >
> > The following plots only print 2 of the 4 labels under the bars, is there
> > a way please to force all 4 labels to print?
> >
> > par(mfrow=c(1,2),mar=c(2,7,3,1))
> > dat<-data.frame("AgeGroup"=c("2-15","16-20","21-25","26-39"),
> > "Aorta"=c(20,8,30,60),
> > "Coronary"=c(7,30,55,65))
> > barplot(dat$Aorta,ylim=c(0,100),names=as.vector(dat$AgeGroup),ylab=c("Prevalence
> > (%)"))
> > title(main=list("Aorta",font=0))
> > barplot(dat$Coro,names=as.vector(dat$Age),ylim=c(0,100))
> > title(main=list("Coronary Artery",font=0))
> >
> Hi Geoff,
>
> Try this:
>
> barplot(dat$Aorta,ylim=c(0,100),
>   names=rep("",length(dat$AgeGroup)),
>   ylab=c("Prevalence (%)"))
> mtext(dat$AgeGroup,1,2)

Thanks, but this puts all the labels overlaying each other in the
2nd line on the bottom of the plot. But

mtext(as.vector(dat$AgeGroup),1,at=c(1,2,3,4))

sort of works and if I play with the "at" argument I could make it work, but I'm
sure there must be a better way.

Geoff.


>
> Jim
>


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