i use this code to get the cluster labels,""cluster_
and the centroids "centers"
but the cvmat centers remains full of zeros.
why?
how can i get the centroids?

#include <iostream>
#include <stdio.h>

#include "cxcore.h"
#include "highgui.h"
using namespace cv;

int main( int argc, char** argv )
{
int i,j;

CvMat* [[CvMat]]* points = cvCreateMat( 5, 2, CV_32FC1 );
CvMat* [[CvMat]]* centers = cvCreateMat( 5, 2, CV_32FC1 );
CvMat* [[CvMat]]* clusters = cvCreateMat( 5, 1, CV_32SC1 );

cvSetReal2D( points, 0, 0,1);
cvSetReal2D( points, 0, 1,1);
cvSetReal2D( points, 1, 0,2);
cvSetReal2D( points, 1, 1,2);
cvSetReal2D( points, 2, 0,6);
cvSetReal2D( points, 2, 1,6);
cvSetReal2D( points, 3, 0,5);
cvSetReal2D( points, 3, 1,5);
cvSetReal2D( points, 4, 0,10);
cvSetReal2D( points, 4, 1,10);

cvKMeans2( points, 3, clusters,
cvTermCriteria( CV_TERMCRIT_EPS, 1000,0 ),1000,0,KMEANS_RANDOM_CENTERS,centers,0);

for(i=0;i<5;i++)
printf( " %lf \n", cvGetReal2D(clusters,i, 0));

for(i=0;i<5;i++){
for(j=0;j<2;j++){
printf( "center %i %i = %lf \n", i, j, cvGetReal2D(centers,i, 0));
}
}

cvReleaseMat(&points);
cvReleaseMat(&centers);
cvReleaseMat(&clusters);
}