Peng Yu wrote:
>
> I'm wondering where is the source of an R function or a package is.
> For example, where is 'attributes'?
>
>> attributes
> function (obj) .Primitive("attributes")
>
> I also do understand what .Primitive mean. Could somebody let me know
> how to locate source file in an R installation? Why typing
> 'attributes' does not give its definition?
>
>
A call to .Primitive() means that the function hands off execution to
internal code in the R environment. This internal code is most likely in
the form of a compiled C or Fortran function.
To see what happens inside a .Primitive() call, you will have to start
digging into the R source code. I think a good place to start may be to
download and unpack the R source and then look at:
R-2.x.y/src/main/names.c
Which contains a table mapping .Primitive() and .Internal() calls to their
c-level counterparts.
Good luck!
-Charlie
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