How to modify EM to show loglikelihood every iteration

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Hello,

i'm having troubles changing the source code for em algorithm. The em algorithm in opencv gives loglikelihood values for every data point. I would like to get the sum of the loglikelihood values for every iteration of the em algorithm. I have tried to modify "opencv\sources\modules\ml\src\em.cpp" by adding :

Mat loglike;
void setloglike(double f) {
    if (loglike.empty())
        loglike = Mat(1, 1, CV_64F);
    loglike.push_back(f);
}
Mat getloglike() const {
    return loglike;
}

After rebuilding i couldnt use this function, it was not "there", so i added to "opencv\sources\modules\ml\include\opencv2\ml.hpp" my lines :

CV_WRAP virtual Mat getloglike() const = 0;
CV_WRAP virtual void setloglike(double f) = 0;

but the result is crashing when i sue that function. I'm calling the function in my own program through this code:

Mat loglikelihood, _label, _probs;
Ptr<EM> em = EM::create();
em->setClustersNumber(K);
em->setCovarianceMatrixType(EM::COV_MAT_DIAGONAL);
em->setTermCriteria(TermCriteria(TermCriteria::TermCriteria::COUNT, 50, 0));
em->trainEM(DATA, loglikelihood, _label, _probs);
Mat Log = em->getloglike();

thank you for your help.