\begin{Schunk}
\begin{Sinput}
  set.seed(1234)
  x1 <- rnorm(3)
  x2 <- rpois(3, lambda = 7)
  x3 <- rnorm(3)
  X <- cbind(x1, x2, x3)
  X
\end{Sinput}
\begin{Soutput}
             x1 x2         x3
[1,] -1.2070657  2 0.03572991
[2,]  0.2774292  5 0.11297506
[3,]  1.0844412  8 1.42855203
\end{Soutput}
\end{Schunk}
