Coloring points in a pairs plot

Question

I would like to color points in a pairs plot based of certain row indexes. Here is the code I used for plotting 1 variable against another.

cases<-which(rown         


        

Answer 1

Something like this?

cols <- character(nrow(iris))
cols[] <- "black"

cols[iris$Species %in% c("setosa","versicolor")] <- "blue"
cols[iris$Species == "virginica"] <- "red"
pairs(iris,col=cols)