[R] Adding LaTeX cross-references into Sweave plots

[Mark Wardle]

Hi.

I don't use figure titles (*) when generating figures for inclusion in
a latex document. Instead, I rely on the latex caption. Otherwise, one
has two titles for a figure.

If you want multiple plots with separate captions, then try subfigures.

Best wishes,

Mark

(*): try main=""

On 27/02/2008, Peter Dunn <dunn at usq.edu.au> wrote:
> Hi all
>
>  I'm using Sweave and LaTeX, and love how they interact.
>
>  But here's a different interaction I'm not sure how to achieve; I
>  hope someone can help.  I use a simple example, of course, to
>  demonstrate.
>
>  Suppose in my LaTeX document I have this:
>
>         Here is a linear equation:
>         \begin{equation}
>                 y = -1 + 3 x
>                 \label{EQ:example}
>         \end{equation}
>
>  This appears in the final product with an Equation number, say (1).
>
>  Now suppose I wish to produce a graphic in R:
>
>         <<fig=TRUE>>=
>         plot( c(-1,1), c(-1,1), type="n",
>                 main="Graph of Eq (1)")
>         abline(-1, 3)
>         @
>
>  All easy.
>
>  But... how to I ensure the correct LaTeX label appears in the plot?
>  You see, if I run LaTeX again, and my equation is no longer
>  labelled (1) and changes to (say) label (3), I have to manually fix
>  the Sweave code to read
>
>         <<fig=TRUE>>=
>         plot( c(-1,1), c(-1,1), type="n",
>                 main="Graph of Eq (3)")
>         abline(-1, 3)
>         @
>
>  Any ideas of how that can be automated?  I guess something like this
>  (though this obviously will fail):
>
>
>         <<fig=TRUE>>=
>         plot( c(-1,1), c(-1,1), type="n",
>                 main="Graph of Eq (\label{EQ:equation})")
>         abline(-1, 3)
>         @
>
>  Thanks as always.
>
>  P.
>
>  --
>  Dr Peter Dunn  |  dunn <at> usq.edu.au
>  Faculty of Sciences, USQ; http://www.sci.usq.edu.au/staff/dunn
>  Aust. Centre for Sustainable Catchments: www.usq.edu.au/acsc
>
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-- 
Dr. Mark Wardle
Specialist registrar, Neurology
Cardiff, UK