Say that you pass an environment R object to an internal C routine through the .Call interface. Said enviromnent has (by design) a someObject object which I want to extract and manipulate from the C side. How to do it?
假设您通过. call接口将环境R对象传递给内部C例程。说环境(设计)是一个我想从C方面提取和操作的物体。如何去做?
To simplify my question, I just want to write a C function that returns someObject. Like this:
为了简化问题，我只想写一个返回某个对象的C函数。是这样的:
en <- new.env()
en$someObject <- someValue
.Call("extractObject",en)
#the above should return en$someObject
Guess the C code should then look something like
我猜C代码应该是这样的
SEXP extractObject(SEXP env) {
return SOMEMACROORFUNCTION(env, "someObject");
}
Unfortunately, I was not able to find the real SOMEMACROORFUNCTION.
不幸的是，我没能找到真正的顶体功能。
1 个解决方案
#1
3
After a little bit of googling and searching, I've found the solution:
在谷歌和搜索了一段时间之后，我找到了解决方案:
findVar(install("someObject"),env)
in the C code is basically the equivalent of get("someObject",env) in R.
在C代码中，基本上等同于R中的get(“someObject”，env)。
#1
3
After a little bit of googling and searching, I've found the solution:
在谷歌和搜索了一段时间之后，我找到了解决方案:
findVar(install("someObject"),env)
in the C code is basically the equivalent of get("someObject",env) in R.
在C代码中，基本上等同于R中的get(“someObject”，env)。