[R] Sweave \Sexpr{} advice please
Tobias Verbeke
tobias.verbeke at openanalytics.be
Sun May 10 10:00:07 CEST 2009
Hi Kyle,
> First off, my deepest gratitude to the Sweave developers: this tool has
> improved my quality greatly.
>
> A question in my work I use \Sexpr{} statements scalar values and the xtable
> package for all manner of tables. What I'd like to do is to use a vector
> inline, rather than a whole separate table. Something like:
>
> %%%%%%%%%%%%%%%% begin code
> % Latex junk
>
> % Sweave block:
> <<>>=
> covmat <- cov(matrix(runif(100),ncol=3))
> @
>
> % back to Latex, typing up a report, my homework, etc.
> The first column of the covariance matrix is $(\Sexpr{covmat[1,1]},
> \Sexpr{covmat[2,1]}, \Sexpr{covmat[3,1]})^T$
>
> %%%%%%%%%%%%%%%%% end code
>
> but, of course, this is poor way of going about it. Any suggestions?
<<loadPkg, echo=FALSE>>=
require(xtable)
@
<<>>=
covmat <- cov(matrix(runif(99), ncol=3)) # 99 not 100
@
The first row of the\dots is
<<firstRow, echo = FALSE, results=tex>>=
xtable(covmat[1,,drop=FALSE])
@
This should get you started. Be sure to
explore the facilities of the xtable package
(you can use captions, labels etc.):
?xtable
?print.xtable
The results=tex option to the chunk is
important as well, of course.
HTH,
Tobias
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