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並前往https://docs.opencv.org/3.4/d3/d63/classcv_1_1Mat.html

cv::Mat Class Reference - OpenCV documentation

add the 5-th row, multiplied by 3 to the 3rd row. M.row(3) = M.row(3) + M.row(5)*3;. // now copy the 7-th column to the 1-st column. // M.col(1) = M.col(7); ...

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