\begin{Schunk}
\begin{Sinput}
 x1a <- vector(mode = "double", length = 10)
 x1b <- double(length = 10) 
 x1c <- numeric(length = 10)
 ## numeric is older terminology
 x1a
\end{Sinput}
\begin{Soutput}
 [1] 0 0 0 0 0 0 0 0 0 0
\end{Soutput}
\begin{Sinput}
 identical(x1a, x1b, x1c)
\end{Sinput}
\begin{Soutput}
[1] TRUE
\end{Soutput}
\end{Schunk}
