 
 	// print debug information
 	if ( LOGGER(LL_DEBUG) ) {
-		printf("%s [%d,%d], %s [%d,%d] <- eig(%s [%d,%d])\n",
+		printf("debug: %s [%d,%d], %s [%d,%d] <- eig(%s [%d,%d])\n",
 		       "V", V->rows, V->cols,
 		       "D", D->rows, D->cols,
 		       "M", M->rows, M->cols);

		dist += diff * diff;
	}

	return sqrt(dist);
}

/**


	// print debug information
	if ( LOGGER(LL_DEBUG) ) {
		printf("debug: %s [%d,%d] <- %s%s [%d,%d] * %s%s [%d,%d]\n",
		       "C", M, N,
		       "A", transA ? "'" : "", M, K,
		       "B", transB ? "'" : "", K, N);
