[Rd] call R function from C code

[Simon Urbanek]

On May 10, 2013, at 5:34 AM, Matwey V. Kornilov wrote:

> 
> Thanks, It is what I was looking for. But now, I poorly understand environment conception. My initial C function in invoked from R (in some environment I suppose), how do I know this env, to provide it to eval()? Or, may I just make a clean env?
> 

It depends on where you want to evaluate it. R_GlobalEnv is the most common - mostly it acts as if you evaluated it on the console. If you want a particular namespace (e.g. myPackage), you can use R_FindNamespace(mkString("myPackage")) to find it.

Cheers,
Simon


> 
> 10.05.2013 00:13, Gabriel Becker пишет:
>> Matwey,
>> 
>> There are a number of ways to do this, but it depends on what exactly you
>> want. Do you want to execute a call to an actual R function from within C,
>> or do you want to directly call one of R's internal C functions (which may
>> work but is not future-safe unless it is part of the official API).
>> 
>> If its the first, see Martin Morgan's post here:
>> http://stackoverflow.com/questions/7457635/calling-r-function-from-c for
>> more detail about the approach I believe Simon is referring to. As for the
>> second, they are normal C functions, but I believe the consensus is that if
>> they aren't part of the API you are on your own figuring out how they work
>> (the source code is available for this of course).
>> 
>> Hope that helps,
>> ~G
> 
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