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std::vector<cv::point2f>

 std::vector<cv::Point2f> center(contours.size() );
std::vector<cv::vector<cv::point> std::vector<cv::vector<cv::Point> > contours_poly( contours.size() );
std::vector<float>radius( contours.size() );
 for(int i=0;i<contours.size;i++){ minenclosingcircle(mat(contours_poly[i]),cv::point_<float="">(center[i]),radius[i]); 
i=0;i<contours.size;i++){
minEnclosingCircle(Mat(contours_poly[i]),cv::Point_<float>(center[i]),radius[i]);
}

but getting this error : Invalid arguments ' Candidates are: void minEnclosingCircle(const cv::_InputArray &, cv::Point_<float> &, float &)'

thanks