Increasing the line thickness in R

Question

I am trying to make a density plot with 2 variables but I need the lines to be thicker. I have used this command:

    >print(plot(density(x,na.rm = T),col="blue",lwd=3,main="Text",cex.main=1.2))

    >lines(density(y,na.rm = T),col="purple",lwd=3)

Although it did thicken the line, below the command it shows: NULL What am I doing wrong? Thanks in advance.

Answer 1

No need for print. Just do:

# Sample data
set.seed(2017);
x <- rnorm(100, 2);
y <- rnorm(100, 2, 3);

plot(density(x, na.rm = T), col = "blue", lwd = 3, main = "Text", cex.main = 1.2);
lines(density(y, na.rm = T), col = "purple", lwd = 3)