Add the RcppOctave engine

[casallas]

• This engine allows to call octave/matlab code within R using RcppOctave

[yihui]

Thanks! This is very interesting, but I'd prefer this function to be in RcppOctave instead, since I do not know much about Octave or RcppOctave and I will not be the best person to maintain this engine. If the RcppOctave author is interested, you will only need something like knitr::knit_engines$set(RcppOctave = RcppOctave::eng_RcppOctave), which does not sound too bad.

Of course, I will have to export the function engine_output() from knitr, which I will be happy to do.

[casallas]

Sounds good Yihui! I'm not the Octave expert myself, I was mainly looking for a way to revive and post some old MATLAB code. After playing with this for a little while I thought there were some neat possibilities for reports generated combining R and Octave code.

Exporting engine_output will be great for package developers. I can think of a few packages that could benefit from having their own engine, like rPython, to make reports combining R and Python code.

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