[R] Adding text to a plot
Jun Yan
jyan at stat.wisc.edu
Wed Jul 3 16:29:32 CEST 2002
> Dear R-users,
>
> again two question...
>
> # Question 1
> Adding two lines of text to a plot, I am using:
>
> # -------------------------------
> plot(k[,1], k[,2], pch=16,
> ylim=range((min(k[,2])-0.2):(max(k[,2])+1)))
>
> a <- paste("Cor.:" ,cor(k[,2],k[,1]))
> b <- paste(nrow(k), "Countries")
>
> text(90, max((k[,2])-0.51), a)
> text(90, max((k[,2])-0.83), b)
> # -------------------------------
> But the distance between the first and second line depends on the
> scale of the y-axis.
text(max(k[,1], max[k,2], labels=paste(a,b,sep="\n"), adj=c(1,1))
You may try pos too.
> Is there a solution to put the lines in the upper right corner,
> independent of the y-scale?
>
> # Question 2
> My data.frame looks like:
> > u
> country gdp50 w5073
> 1.AUS AUS 77.15967 2.1708460
> 1.AUT AUT 74.06830 1.8691745
> 1.BEL BEL 77.87497 1.7547546
> 1.CAN CAN 87.07300 1.3649655
> [...]
>
> To add labels on points in a plot I call:
> text(x=u[,2]+chw, y=u[,3], labels=levels(u[,1]), adj=0 )
>
> How can I label only the datapoints for 'CAN' and 'AUS'?
You may extract only those levels you need and text it. However, You need
to be careful in this case. Your data happens to be sorted by country,
which makes it in the same order as the levels of the factor
country. Another way to do this might be to use different symbols and give
a legend.
Jun
>
> Thanks for any help
> Patrick
> -------------
> Patrick Hausmann
> Friedrich-Wilhelm Str. 37 - D-28199 Bremen
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