Incompatibility between the emaxima LaTeX mode and the knitr R package.

I just looked at the source code of emaxima.sty; it uses the pdftex
option when you produce PDF output. Then I think you can modify my
hook accordingly, e.g.

<<no-color, include=FALSE>>=
knit_hooks$set(document = function(x) {
  sub('\\usepackage{graphicx, color}',
      '\\usepackage{graphicx}\\usepackage[pdftex]{color}',
      x, fixed = TRUE)
})
@

Hopefully this can avoid clash with emaxima.

Regards,
Yihui
--
Yihui Xie <xieyihui at gmail.com>
Phone: 515-294-2465 Web: http://yihui.name
Department of Statistics, Iowa State University
2215 Snedecor Hall, Ames, IA


On Sun, Nov 25, 2012 at 2:22 PM, Emmanuel Charpentier
<emm.charpentier at free.fr> wrote:
> Dear Yihui,
>
> Unfortunately, your solution does not apply. The knitr-added preamble
> still defines a bunch of latex commands using color commands from
> color...
>
> One could redefine them without using color, but I'm afraid this entails
> a large work. I fear that readapting emaxima might be easier...
>
> Sincerely yours,
>
>                                         Emmanuel Charpentier
>
> Le dimanche 25 novembre 2012 ? 13:13 -0600, Yihui Xie a ?crit :
>> Hi,
>>
>> On knitr's side, you can remove the color package using the `document`
>> hook (if you have the latest version of knitr), e.g.
>>
>> <<no-color, include=FALSE>>=
>> knit_hooks$set(document = function(x) {
>>   sub('\\usepackage{graphicx, color}', '\\usepackage{graphicx}', x,
>> fixed = TRUE)
>> })
>> @
>>
>>
>> Regards,
>> Yihui
>> --
>> Yihui Xie <xieyihui at gmail.com>
>> Phone: 515-294-2465 Web: http://yihui.name
>> Department of Statistics, Iowa State University
>> 2215 Snedecor Hall, Ames, IA
>>
>>
>> On Sun, Nov 25, 2012 at 11:19 AM, Emmanuel Charpentier
>> <emm.charpentier at free.fr> wrote:
>> > Dear Xie, dear list,
>> >
>> > In order to add some trace of symbolic computations related to a
>> > statistical problem in the relevant document, created via R and knitr, I
>> > tried to use the emaxima LaTeX style (which I already had used
>> > successfully in another Sweave-processed .Rnw file).
>> >
>> > It turns out that this is not currently possible :
>> >
>> > - the knitting process adds \usepackage{graphicx, color} right after the
>> > \documentclass declaration opening the .Rnw file.
>> >
>> > - The emaxima package also uses color, in an incompatible way. From the
>> > pdflatex log :
>> >
>> > ==============================================================
>> > (/usr/share/texmf/tex/latex/emaxima.sty
>> > (/usr/share/texlive/texmf-dist/tex/latex/base/ifthen.sty)
>> >
>> > ! LaTeX Error: Option clash for package color.
>> >
>> > See the LaTeX manual or LaTeX Companion for explanation.
>> > Type  H <return>  for immediate help.
>> >  ...
>> >
>> > l.85 \usepackage
>> >                 {pdfcolmk}
>> > ?
>> > ! Emergency stop.
>> >  ...
>> >
>> > l.85 \usepackage
>> >                 {pdfcolmk}
>> > !  ==> Fatal error occurred, no output PDF file produced!
>> > ==============================================================
>> >
>> > Can someone suggest a workaround ?
>> >
>> > Sincerely,
>> >
>> >                                         Emmanuel Charpentier
>> >
>> >
>
>