R：汽车包装中的scatterplot（），如何添加点标签？

Question

I want to scatterplot two variables with point labels (a label for each data point). One can do this with plot() and textxy() among others, but I like the scatterplot() function from the car package. However, I can't figure out how to use it.

library(car)
test.x = c(1,2,3,4,5,6) #x var data
test.y = test.x*2 #x var data
test.labels = c("a","b","c","d","e","f") #labels
scatterplot(test.y ~ test.x, labels=as.vector(test.labels),smooth=F) #plot

It plots it without errors, but there are no labels.

Using textxy() works, but since scatterplot() draws differently than plot() the labels and datapoints are displaced.

Answer 1

You got to set id.n , too. Eg

scatterplot(test.y ~ test.x, labels=test.labels,smooth=F, id.n = length(test.labels)) 

to plot all labels.