On 09/16/2009 09:40 AM, Abhijit Bera wrote:
So I should use the R parser?
If you want to parse R code, yes
Actually I'm trying to develop a JS interface for R. So I'm terribly
confused with the design aspects. Won't parsing be slower?
sure. but I suspect SWX.RET[1:6,c("SBI,"SPI","SII")] is not the only
expression you want your interface to deal with ?
in the code you sent, you acted as the parser, and I believe this has
been slower than this:
> system.time( parse( text = 'SWX.RET[1:6,c("SBI", "SPI", "SII")]' ) )
user system elapsed
0.001 0.000 0.001
Do you want it to be faster than this ?
Is there a better way to do what I'm doing other than parsing?
>
Regards
Abhijit
On Wed, SSep 16, 2009 at 12:48 PM, Romain Francois
<romain.franc...@dbmail.com <mailto:romain.franc...@dbmail.com>> wrote:
Hi,
Luckily, R has its own parser, so you don't have to reimplement it.
Just parse your string 'SWX.RET[1:6,c("SBI,"SPI","SII")]' and eval
the parsed expression(s). The R_ParseVector function will help you.
Romain
On 09/16/2009 09:02 AM, Abhijit Bera wrote:
I'm trying to get a reference to this object in C
SWX.RET[1:6,c("SBI,"SPI","SII")]
While i am able to access and use a plain SWX.RET object, I'm
getting
confused on how to create an object with the array subscripts
like above.
Here is what I tried to do. It doesn't work because "[" is
obviously not an
operation or function on SWX.RET. So how do I get a reference to
this
object?
#include<stdio.h>
#include<R.h>
#include<Rinternals.h>
#include<Rdefines.h>
#include<Rembedded.h>
int main(int argc, char** argv)
{
SEXP e,c,portSpec,portData,portConstr,portVal,tsAssets;
int errorOccurred,nx,ny,i,j;
double *v;
const char *x,*y;
Rf_initEmbeddedR(argc, argv);
// loading fPortfolio
PROTECT(e = lang2(install("library"), mkString("fPortfolio")));
R_tryEval(e, R_GlobalEnv, NULL);
UNPROTECT(1);
// creating a default portfolioSpec object
PROTECT(e=lang1(install("portfolioSpec")));
PROTECT(portSpec=R_tryEval(e,R_GlobalEnv, NULL));
// creating a portfolioData object
PROTECT(e=lang4(install("c"),mkString("SBI"),mkString("SPI"),mkString("SII")));
PROTECT(c=R_tryEval(e,R_GlobalEnv,NULL));
PROTECT(e=lang3(install("["),install("SWX.RET"),c));
PROTECT(portData=R_tryEval(e,R_GlobalEnv,NULL));
PROTECT(e=lang2(install("print"),portData));
R_tryEval(e,R_GlobalEnv,NULL);
UNPROTECT(3);
Rf_endEmbeddedR(0);
return 0;
}
--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
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