Re: [R] vignettes: .png graphics or pre-compiled .pdf

[Achim Zeileis]

On Wed, 18 Nov 2009, Michael Friendly wrote:

Achim Zeileis wrote:
On Fri, 13 Nov 2009, Michael Friendly wrote:
Alternatively, is there a way to generate .png graphs from the .Rnw file 
so that those are used in building
the .pdf for the package?  AFAICS, \SweaveOpts{} offers only the choices 
of eps/pdf = {TRUE/FALSE}.

Yes, but you can call the png() device yourself within the code chunk

<<>>=
png(file = "fig1.png", ...)
...
dev.off()
@

and then put

\includegraphics{fig1}

manually into the LaTeX. It's certainly not as nice as Sweave's automatic 
handling of figures but will work and still keep the file self-contained.
Z

Thanks, Achim

This works, but has the infelicitous effect that both the png() call and 
dev.off(), with its output appear in the vignette (with echo=TRUE)

% do .png manually ...
<<fig1cpng, fig=TRUE, pdf=FALSE, eval=TRUE, echo=TRUE, debug=TRUE, 
results=verbatim, include=FALSE>>=
png(file="figs/fig-fig1c.png", width=4, height=4, units="in", res=72)
# plot stuff ...
dev.off()
@

I suppose I could break this up into 3 chunks as follows, but is there some 
other way, either with R or LaTeX constructs?

<<echo=FALSE>>=
png(file="figs/fig-fig1c.png", width=4, height=4, units="in", res=72)
@
<<fig1cpng, fig=TRUE, pdf=FALSE, eval=TRUE, echo=TRUE, debug=TRUE, 
results=verbatim, include=FALSE>>=
# plot stuff  ...
@
<<echo=FALSE>>=
dev.off()
@

I typically re-use the code chunks, e.g.:

<<myplot, echo=TRUE, eval=FALSE>>=
plot(...)
@

<<myplot-png, echo=FALSE, eval=TRUE>>=
png(...)
<<myplot>>
dev.off()
@

which is also convenient if you want to add par() settings (e.g., 
mfrow/mfcol) and have the code somewhere in the text but the resulting 
figure in a floating environment.
Z


--
Michael Friendly     Email: friendly AT yorku DOT ca Professor, Psychology 
Dept.
York University      Voice: 416 736-5115 x66249 Fax: 416 736-5814
4700 Keele Street    http://www.math.yorku.ca/SCS/friendly.html
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