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# How to label points in scatterplot created by using xyplot in R?

To label points in scatterplot created by using xyplot, we can follow the below steps −

- First of all, creating two numerical and one categorical vector.
- Loading lattice package and creating scatterplot.
- Creating the scatterplot with points labelled using categorical vector by panel.xyplot and ltext function.

## Creating the vectors

Create three vectors, one categorical and two numerical −

x<-sample(1:10,5) y<-sample(1:10,5) Dots<-c("A","B","C","D","E") x y Dots

On executing, the above script generates the below output(this output will vary on your system due to randomization) −

[1] 7 3 2 10 5 [1] 1 2 5 4 8 [1] "A" "B" "C" "D" "E"

## Loading lattice package and creating scatterplot

Use xyplot function to create the scatterplot between x and y −

library(lattice) xyplot(y~x,data=data.frame(x,y),pch=20,cex=2)

### Output

## Creating the scatterplot with labels

Use panel.xyplot and ltext to create the scatterplot with labels −

x<-sample(1:10,5) y<-sample(1:10,5) Dots<-c("A","B","C","D","E") xyplot(y~x,data=data.frame(x,y),pch=20,cex=2,panel=function(x,y,...){ + panel.xyplot(x,y,...); + ltext(x=x,y=y,labels=Dots,pos=1)})

### Output

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