Selon Gabor Csardi <[EMAIL PROTECTED]>:
> On Thu, Feb 02, 2006 at 03:11:42PM +0100, [EMAIL PROTECTED] wrote:
> [...]
> >
> > and my test code in C is:
> > ================================================
> > SEXP VPCEfron(SEXP f, SEXP SR, SEXP ZR, SEXP DIR, SEXP nsR, SEXP rho)
> > {
> > int taille=INTEGER(nsR)[0];
> [...]
> >
> > All works, except ZS, the variable ZS is a matrix in R, and when i try to
> give
> > to C code, with ZR, ZR is only a vector.
> >
> > How to obtain a matrix variable in C ?
>
> A matrix is the same as a vector (stored columnwise), except that is has a
> dim attribute. Use can use SET_DIM to set the dim attribute, and GET_dim to
> query it. Eg:
>
> int nrow=INTEGER(GET_DIM(ZR))[0];
> int ncol=INTEGER(GET_DIM(ZR))[1];
>
> To access the values in the matrix you might use something like:
>
> #define RMATRIX(m,i,j) (REAL(m)[ INTEGER(GET_DIM(m))[0]*(j)+(i) ])
>
> and then
>
> RMATRIX(ZR, 0, 1), etc. works. Note that according to this #define the
> matrix
> is indexed from zero.
>
> Gabor
>
>
> --
> Csardi Gabor <[EMAIL PROTECTED]> MTA RMKI, ELTE TTK
>
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>
I try but i think that i make some mistake because i obtain segment fault.
To be sure, i reduce the code to permit to test it, the goal is just to print
the variable, i try with vector variables (real X and integer dX in the
following), it works; but with matrix it doesn't work.
The code of the R program - 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)
{
# A OPTIMISER
VPCEfron<-function(f,XT,ZT,dXT,tailleS=length(XT))
{
f.check<-function(x) {
x<-f(x)
}
.Call("VPCEfron",body(f.check),as.double(XT),as.double(ZT),as.integer(dXT),as.integer(tailleS),new.env())
}
GG<-function(z) G(z,c0,c1)
Vraisemblancepartielle<-VPCEfron(GG,XType,ZType,dXType)
}
resultat<-VPEfron(X,Z,dX,Phi,0,0)
==============================
The code of C code - test.c and test.so is obtained by "R CMD SHLIB test.c"
================================
#include <R.h>
#include <Rdefines.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 rho)
{
double* X=REAL(XR);
int* DI=INTEGER(DIR);
int nligne=INTEGER(GET_DIM(ZR))[0];
int ncol=INTEGER(GET_DIM(ZR))[1];
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));
printf("%f %f\n",RMATRIX(ZR,0,1));
printf("%f %f\n",RMATRIX(ZR,1,0));
printf("%f %f\n",RMATRIX(ZR,2,0));
return mkans(0.0);
}
=====================================
You can save these two simple programs in order to test my code.
Thanks.
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