\begin{Schunk}
\begin{Sinput}
 x1 <- 1:4; x2 <- 5:8; x3 <- 9:12;
 x4 <- 13:16; x5 <- 17:20; x6 <- 21:24
 cbind(x1, x2, x3, x4, x5, x6)
\end{Sinput}
\begin{Soutput}
     x1 x2 x3 x4 x5 x6
[1,]  1  5  9 13 17 21
[2,]  2  6 10 14 18 22
[3,]  3  7 11 15 19 23
[4,]  4  8 12 16 20 24
\end{Soutput}
\end{Schunk}
