Question

I have a matrix of 12 columns, and I am using boxplot function in R to plot the boxplot.

following commands are used:

pdf("data.pdf") 
data<-read.table("data1", header=T) 
boxplot(data, outline=F)
dev.off()

What I want, is to present the first three boxplots in red, green, and blue. while the next three in yellow, next three in orange and next three in purple.

How can I do this?

Thank you

Answer 1

To get colours, you just need to pass a vector of colours to the boxplot function:

##Create some dummy data
runif(10*12), ncol=12)
##Create a vector of 12 colours
cols = rep(c("yellow", "orange", "purple"), each=3)
cols = col=c("red", "green","blue",cols)

##Plot as normal
boxplot(dd, col=cols)

---

BTW, don’t load your data at every iteration of your for loop. Load it once:

data <- read.table("data1", header=T) 
pdf("data.pdf") 
boxplot(data, outline=F)
dev.off()