R devel - Jun 2014 - Need help on calling Head from C

Hi ,

I am trying to call head function from C . My doubt is with the parameter
n,how to pass it .

PROTECT(dfm=lang3(install("data.frame"),df,ScalarLogical(FALSE)));
SET_TAG(CDDR(dfm), install("stringsAsFactors")) ;
SEXP res = PROTECT(eval(dfm,R_GlobalEnv));
PROTECT(head=lang3(install("head"),res,ScalarInteger(1)));
head  = PROTECT(eval(head,R_GlobalEnv));


I tried the above following , it seemed to be not working . Can you please
help.

Thanks

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On Jun 25, 2014, at 11:31 PM, Sandip Nandi <sannandi at umail.iu.edu>
wrote:
> Hi ,
> 
> I am trying to call head function from C . My doubt is with the parameter
> n,how to pass it .
> 
>
PROTECT(dfm=lang3(install("data.frame"),df,ScalarLogical(FALSE)));
> SET_TAG(CDDR(dfm), install("stringsAsFactors")) ;
> SEXP res = PROTECT(eval(dfm,R_GlobalEnv));
> PROTECT(head=lang3(install("head"),res,ScalarInteger(1)));
> head  = PROTECT(eval(head,R_GlobalEnv));
> 
> 
> I tried the above following , it seemed to be not working . Can you please
> help.
> 
Can you elaborate? The above code works AFAICT ...

Cheers,
S


> Thanks
> 
> 	[[alternative HTML version deleted]]
> 
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