[R] Creating a Legend

baptiste auguie ba208 at exeter.ac.uk
Thu Sep 25 11:47:38 CEST 2008


I think you want the following,

df <- data.frame(x=rnorm(100), y=rnorm(100))
legend("topright", title="Land Use Type", cex=0.75, pch=16,
		col=c("red", "green"),legend=c("Urban", "green"), ncol=2)

I could not find a way to have a different text size for the title,  
but it's easy to do in lattice or ggplot2.


On 23 Sep 2008, at 17:56, Steve Murray wrote:

> Dear all,
> I'm trying to create a legend for my graph. I hope to have the title  
> as "Land Use Type" and the two elements being "Urban" and "Rural"  
> with a red point and green point respectively. So far I have the  
> following command, but obviously it isn't correct:
>> legend("topright", title="Land Use Type", cex=0.75, pch=16,  
>> col="red","Urban"&"green","Rural", ncol=2)
> As you can see, I'm a bit confused as to how to deal with the point  
> colours and associated text.
> Also, how would I make the associated text ("Urban" and "Rural")  
> smaller than the title?
> Many thanks for any suggestions!
> Steve
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Baptiste Auguié

School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,

Phone: +44 1392 264187


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