\begin{Schunk}
\begin{Sinput}
 x <- c(55L, 2L, 3L, 3L, 4L)
 x
\end{Sinput}
\begin{Soutput}
[1] 55  2  3  3  4
\end{Soutput}
\begin{Sinput}
 is.integer(x)
\end{Sinput}
\begin{Soutput}
[1] TRUE
\end{Soutput}
\end{Schunk}
