[R] Export a function from RCPP in R of type double

[Dirk Eddelbuettel]

On 2 June 2011 at 01:27, arvanitis wrote:
| I have written a small c++ function of type double function(double,double);
| and i want to export it in R using RCPP. After some trials i have realized

Rcpp uses the .Call() interface which imposes 'SEXP function(SEXP, SEXP, ...);

Please see 'Writing R Extensions' manual for details on this, and the Rcpp
documentation (maybe starting with Rcpp-introduction.pdf) for more on Rcpp.

Rcpp-specific questions should go to the rcpp-devel mailing list.

Regards, Dirk

| that the only way i could do it working is to declare the function as void
| function (double x, double y, double result) and pass the result with RCPP
| Can you please tell me if this is the only way out?
| And if this is the case how I can implement a function with is recurence
| property eg a Factorial funtion
| int factorial (int a){ a=factorial(a-1);}
| 
| tnks in advance for your help
| 
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