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AKAZE descriptors are uchar Mat's, both Vec3b features = desc1.at<Vec3b>(2, 2); and descriptor.at<float>(0,0); are wrong.
the only correct way would be:
descriptor.at<uchar>(m,n); // m in [0..descriptor.rows] n in [0..60]
please try to avoid this kind of coding at all, just print out the whole Mat, like:
cout << descriptor << endl; //