From alok.jadhav at credit-suisse.com  Thu Oct 13 09:20:54 2011
From: alok.jadhav at credit-suisse.com (Alok Jadhav)
Date: Thu, 13 Oct 2011 00:20:54 -0700 (PDT)
Subject: [Rd] how to return a matrix of strings from c to R ?
Message-ID: <1318490454016-3900763.post@n4.nabble.com>

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