[R] Injecting code in a package?

[Uwe Ligges]

On 28.01.2011 14:57, Nick Sabbe wrote:
> Dear list,
>
>
>
> I've had this a few times now, and wonder if this is possible:
>
> I'm using a package, often for plotting something, but I want to tune the
> way the plotting goes, in a way that was not foreseen by the maker of the
> package.
>
> Now, most of the time, these kinds of R functions (say pkg::plot.something)
> call into other R functions (say pkg::plot.something.internal), and it is
> these that I want to tinker with.
>
>
>
> So, my question is: can I replace an R function in a package with  a version
> of my own, without having to somehow rebuild the package? I don't just want
> a non-package bound copy of the function, I want to make sure that when I
> call pkg::plot.something, this works as before, but when, from within this
> function, pkg:: plot.something.internal is called, I want it to call _my_
> version of it.
>
>
>
> Any takes?


For just doing it once:
See ?fixInNamespace and ?assignInNamespace

Other ideas:
- Compile the package with changed functionality for your own.
- Contribute to the existing package and add the features you like to see

Uwe Ligges



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