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va is double type and your Mat is float (CV32FC1) . You should use float for array or Mat of double type

cv::Mat VC(1, 3, CV_64FC1, va);

va is double type and your Mat is float (CV32FC1) . You should use float for array or Mat of double typetype (CV_64FC1)

cv::Mat VC(1, 3, CV_64FC1, va);