\begin{Schunk}
\begin{Sinput}
 mAndM <- expand.grid(as.data.frame(newdf))
 head(mAndM, 10)
\end{Sinput}
\begin{Soutput}
      x1    x2
1  19.42 19.51
2  43.37 19.51
3  50.50 19.51
4  56.85 19.51
5  85.02 19.51
6  19.42 43.35
7  43.37 43.35
8  50.50 43.35
9  56.85 43.35
10 85.02 43.35
\end{Soutput}
\end{Schunk}
