gistfile1.txt

//
// $ gcc -I/usr/local/opencv2.1/include/ -std=c99 -L/usr/local/opencv2.1/lib -lhighgui -lcv -lcxcore -o cvmattest cvmattest.c
// $ DYLD_LIBRARY_PATH=/usr/local/opencv2.1/lib ./cvmattest
//
#include <stdio.h>
#include <stdlib.h>
#include <opencv/cv.h>
#include <opencv/cxcore.h>

int
main(int argc, char *argv[])
{   
    CvMat *mat, *src, *dst;
    mat = cvCreateMat(3, 3, CV_32FC1);
    src = cvCreateMat(3, 1, CV_32FC1);
    dst = cvCreateMat(3, 1, CV_32FC1);
   
    cvmSet(mat, 0, 0, 1);
    cvmSet(mat, 0, 1, 0);
    cvmSet(mat, 0, 2, 1);

    cvmSet(mat, 1, 0, 0);
    cvmSet(mat, 1, 1, 1);
    cvmSet(mat, 1, 2, 0);

    cvmSet(mat, 2, 0, 0);
    cvmSet(mat, 2, 1, 0);
    cvmSet(mat, 2, 2, 1);

    cvmSet(src, 0, 0, 1);
    cvmSet(src, 1, 0, 1);
    cvmSet(src, 2, 0, 1);

    cvmMul(mat, src, dst);

    printf("dst=(%f, %f, %f)\n",
            dst->data.fl[0],
            dst->data.fl[1],
            dst->data.fl[2]
    );

    return 0;
}