[Rd] how to return a matrix of strings from c to R ?

[Alok Jadhav]

I am a bit confused about usage of R internal functions. I am able to send a
char vector from C to R but not sure on how to send a vector of strings etc.

My code looks like this.

<code>

                SEXP result =
PROTECT(Rf_allocMatrix(STRSXP,s->n_rics,s->n_fields));

                int i,j;
                for (i=0; i < s->n_rics; i++)
                {
                        for (j=0; j < s->n_fields; j++)
                        {
                                std::string text = s->data[j][i];
                                result[j][i] = R_alloc( text.length(), 
sizeof(char));
                                //strcpy(result[j][i], text.c_str());
                                
SET_STRING_ELT(result[j][i],0,Rf_mkChar(text.c_str()));
                        }
                }

//              memcpy(result,s->data.ref(),s->n_fields*s->n_rics*sizeof(200));
                UNPROTECT(1);
                return result;

</code>

Can someone please make me understand this usecase and how to resolve it?

thanks,
Alok

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