[R] Plot where points are treatment letter

[Peter Langfelder]

Here's an example:

x = c(1,2,3,4,5);
y = rnorm(5);

labels = LETTERS[1:5];

plot(x,y, type = "n") # This sets up the plot but doesn't actually
plot the points
text(x,y, labels) # This adds labels to positions (x,y)

HTH,

Peter

On Tue, Feb 8, 2011 at 12:42 PM, Schatzi <adele_thompson at cargill.com> wrote:
>
> I would like to create a plot of y vs x with different treatments where the
> points are actually the letter of the treatment. Here is the code:
>
> A<-as.matrix(rnorm(10,10))
> B<-as.matrix(rnorm(10,9.5))
> C<-as.matrix(rnorm(10,10.5))
> Y<-as.matrix(rnorm(30,13))
> X<-rbind(A,B,C)
> nA<-matrix("A",10,1)
> nB<-matrix("B",10,1)
> nC<-matrix("C",10,1)
> TRT<-rbind(nA,nB,nC)
>
> plot(X,Y)
> xyplot(Y~X,groups = TRT)
>
> The last plot colors the points by treatment, but it uses points, not the
> letter for each treatment. Does anyone know how to do this? It seems simple
> enough and I'm sure it is very easy, I just cannot figure it out nor have I
> found the code. Thank you.
>
>
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