Hi,
that's not going to fly.
A CharacterVector holds strings of arbitrary lengths, well technically it holds
other R objects (SEXP) that hold pointers to strings.
A RawVector holds unsigned char.
Can you add some meat to your example, e.g. what you'd expect to go in, etc ...
Romain
> Le 20 oct. 2014 à 21:17, Gustaf Granath <gustaf.gran...@gmail.com> a écrit :
>
> Hi
> Im trying to use some C++ functions in R. However, these functions are build
> around unsigned char* variables (1D array). I have for example a large matrix
> in R that represents black (e.g. 1-bit image, 0 and 1s). I cant find a
> solution to convert a character vector into unsigned char* within Rcpp. Im
> new to Rcpp and C++ so I might have missed something obvious here. Please
> direct me to resources on this topic (google did not help much).
>
> A start:
>
> SEXP test(SEXP cM){
> CharacterVector Vc(cM);
> int n = Vr.size();
> RawVector x(n); //is this the same as unsigned char* ?
> //I tried to fill it with char*(Mr) but I didnt
> succeed
> }
>
> Thanks,
>
> Gustaf
>
> --
> Gustaf Granath (PhD)
> Post doc
> McMaster University
> School of Geography & Earth Sciences
>
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