\begin{Schunk}
\begin{Sinput}
 z <- c(-2, -0.4, 0, 1, 2, 3)
 log(z)
\end{Sinput}
\begin{Soutput}
[1]       NaN       NaN      -Inf 0.0000000 0.6931472 1.0986123
\end{Soutput}
\end{Schunk}
