\begin{Schunk}
\begin{Sinput}
 plot(x = c(-5, 5), y = c(-10, 20), type = "n", xlab = "", ylab = "")
 x <- c(-2, 1, 3)
 y <- c(9, 7, 2)
 points(x = x, y = y)
 ## Same result as
 ## points(x, y)
 ## because of R positional matches
\end{Sinput}
\end{Schunk}
