[R] how to use \Sexpr{} with sweave

Duncan Murdoch murdoch at stats.uwo.ca
Sun Oct 7 12:37:20 CEST 2007

cryan at binghamton.edu wrote:
> I'm trying to learn Sweave.  So far things are going well with the chunks of code identified by << >>=
> But I'm having trouble with the in-line text use of \Sexpr.
> Here is a short example .Rnw file:
> \documentclass[12pt]{article}
> \usepackage[margin=1.25in]{geometry}
> \usepackage{graphicx}
> \usepackage{Sweave}
> \begin{document}
> <<test>>=
> pnorm(1)
> @
> \Sexpr{2+6}
> \end{document}
> The .tex file that it yields contains 
> \Sexpr{2+6} as its next-to-last line.  \usepackage{Sweave} is in its preamble.
> When I pdflatex that file, the resulting pdf file shows the proper value of pnorm(1), but it does not contain "8" near its end.  Instead it contains "2+6".  I had expected the computed value.
> Also, pdflatex gives me a message that "there was an error opening the document.  The file cannot be found." I have to go find it and open it, instead of it opening automatically like a non-problematic case would.
> Running R 2.5.1 on WinXP, with MikTex.
> Any advice? Thanks.
How did you produce the .tex file?  I just cut and pasted your file into 
test.Rnw, and Sweave( "test.Rnw" ) produced the .tex file shown below, 
with no 2+6 in it.



 > pnorm(1)
[1] 0.8413447



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