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\documentclass{article}\SweaveOpts{engine=R,eps=FALSE,pdf=TRUE,strip.white=true,keep.source=TRUE}\usepackage{Sweave}\begin{document}<<preliminaries, echo=FALSE, results=hide>>=options(width=70, useFancyQuotes = FALSE, prompt="R> ", continue="+ ")@\subsection*{Introduction}We generate 3D gaussian data,We generate 3D Gaussian data,<<ex1-U3>>=set.seed(1)n <- 100x <- rnorm(n); y <- 2*x + rnorm(n)/2U3 <- cbind(x, y, z = -3*x + y + rnorm(n)/4)@look at its structure<<str>>=str(U3) # its structure ((comment kept))@and load package \texttt{lattice}<<req-lattice>>=if(!require("lattice", quietly = TRUE)) q("no")@to visualize it by a simple scatter plot matrix\begin{figure}[h!]\centering<<splom-def, eval=false>>=splom(U3, xlab ="", cex = 0.4)<<splom, echo=FALSE, fig=TRUE, height=5>>=print(<<splom-def>>)@\caption{\Sexpr{n} vectors of random variates ... ...}\label{fig:AC_Joe}\end{figure}\subsection*{Session Information}<<sessionInfo, results=tex>>=toLatex(sessionInfo())@\end{document}