[R] Matrix variable in C code

[depire@inrets.fr]

I correct a little my code, in R code, i use "as.matrix" for ZT, so i haven't
got "segment fault" but it seems that i transmit only the first colon and
because "ncol" gives "1" and not "2".

So what happen ?

Programs

==== R CODE - test.R =====
X<-c(4,2,3,2)
Z<-c(40,21,30,20)
dX<-c(2,1,1)

dyn.load("test.so")

Phi<-function(z,a,b)
{
	Phi<-z
}

VPEfron<-function(XType,ZType,dXType,G,c0,c1)
{
	####################
	ZT<-matrix(0,3,2)
	ZT[1,1]<-Z[2]
	ZT[1,2]<-Z[4]
	ZT[2,1]<-Z[3]
	ZT[3,1]<-Z[1]
	####################
	
	print(ZT)
	# A OPTIMISER
      VPCEfron<-function(f,XT,ZT,dXT,tailleS)
      {
		f.check<-function(x) {
            x<-f(x)
            }
     
.Call("VPCEfron",body(f.check),as.double(XT),as.matrix(ZT),as.integer(dXT),as.integer(tailleS),new.env())
	}

	GG<-function(z) G(z,c0,c1)

VPEfron<-VPCEfron(GG,XType,ZType,dXType,length(XType))
}

resultat<-VPEfron(X,Z,dX,Phi,0,0)
==== END R CODE ==========

==== C CODE of test.c ============
#include <R.h>
#include <Rdefines.h>
#include <Rinternals.h>

#define RMATRIX(m,i,j) (REAL(m)[ INTEGER(GET_DIM(m))[0]*(j)+(i) ])

SEXP mkans(double x)
{
	SEXP ans;
	PROTECT(ans = allocVector(REALSXP,1));
	REAL(ans)[0]=x;
	UNPROTECT(1);
	return ans;
}

SEXP VPCEfron(SEXP f, SEXP XR, SEXP ZR, SEXP DIR, SEXP tailleR, SEXP rho)
{
	double* X=REAL(XR);
	int* DI=INTEGER(DIR);
	int taille=INTEGER(tailleR)[0];
	int nligne=INTEGER(GET_DIM(ZR))[0];
	int ncol=INTEGER(GET_DIM(ZR))[1];

	printf("verifie taille: %d\n",taille);
	printf("verifie de X: %f - %f - %f - %f\n",X[0],X[1],X[2],X[3]);
	printf("verifie dX: %d %d %d\n",DI[0],DI[1],DI[2]);

	printf("verifie de Z\n");
	printf("%d %d\n",nligne,ncol);
	printf("%f %f\n",RMATRIX(ZR,0,0),RMATRIX(ZR,0,1));
	printf("%f %f\n",RMATRIX(ZR,1,0),RMATRIX(ZR,1,1));
	printf("%f %f\n",RMATRIX(ZR,2,0),RMATRIX(ZR,2,1));

	return mkans(0.0);
}
==== END CODE =====