R：绘制并保存在pdf文件中

Question

Write R code to draw sample of size 100 from N(0,1) and N(5,1) each . Plot the two figures on the same graph.Save the graph as Sample.pdf in the working directory I .

My attempt :

 pdf("SampleGraph.pdf",width=7,height=5)
 x=rnorm(100)
 y=rnorm(100,5,1)
 plot(x,lty=2,lwd=2,col="red")
 lines(y,lty=3,col="green")
 dev.off()

It's not working.

Answer 1

It works for me.

Check the working directory for the Sample.pdf file:

> getwd()
[1] "C:/Users/user2983722/Documents"

Answer 2

If your problem is the lack of green points on the plot, here is the fix:

plot(x,lty=2,lwd=2,col="red", ylim = c(min(x,y),max(x,y)))
points(y,lty=3,col="green")