R devel - Oct 2009 - Help with lang4

Hi

I seem to have run into a situation where I have more than 3 arguments to
pass to a function from C.

the following functions help me build an expression for evaluation:

lang
lang2
lang3
lang4

What should one do if there are more arguments than lang4 can handle?

Regards

Abhijit Bera

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On 10/29/09 7:00 AM, Abhijit Bera wrote:
> Hi
>
> I seem to have run into a situation where I have more than 3 arguments to
> pass to a function from C.
>
> the following functions help me build an expression for evaluation:
>
> lang
> lang2
> lang3
> lang4
>
> What should one do if there are more arguments than lang4 can handle?
If you take a look at the source code for those functions, something may 
suggest itself.  R function calls at the C level are composed like in 
lisp: a pair-list starting with the function cons'ed with the args.

+ seth

Can't find the source to Rf_lang* series of functions. :|

But I'm thinking it should be like this correct me if I'm wrong:

PROTECT(e=lang4(install("myfunction"),arg1,arg2,arg3);
PROTECT(SETCAR(CDR(e),portConstraints));
PROTECT(portVal=R_tryEval(e,R_GlobalEnv, NULL));

Regards
Abhijit Bera


On Thu, Oct 29, 2009 at 7:14 PM, Seth Falcon <seth@userprimary.net> wrote:
> On 10/29/09 7:00 AM, Abhijit Bera wrote:
>
>> Hi
>>
>> I seem to have run into a situation where I have more than 3 arguments
to
>> pass to a function from C.
>>
>> the following functions help me build an expression for evaluation:
>>
>> lang
>> lang2
>> lang3
>> lang4
>>
>> What should one do if there are more arguments than lang4 can handle?
>>
>
> If you take a look at the source code for those functions, something may
> suggest itself.  R function calls at the C level are composed like in lisp:
> a pair-list starting with the function cons'ed with the args.
>
> + seth
>
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