Plot sine curve in R

Question

How can I plot a generic sin curve in R? Based on the answer of this post, I tried:

x <- seq(0,pi,length.out=100)
y <- sin(x)
plot(x,y,type="l")

Actually what I really would is this graph, produced by gnuplot:

plot sin(x) linestyle 1

Furthermore, I would like to know why gnuplot produces a graph even if I do not assign any value to the variable x. Does it have a preassigned value or something else?

Answer 1

pi is just one half of a sine curve... add more pi so you will get more curves...

x <- seq(0,8*pi,length.out=100)
y <- sin(x)
plot(x,y,type="l")