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View Compilation Error

0_0_12980877_21795.cpp: In function `Mat Multi(Mat&, Mat&)':
0_0_12980877_21795.cpp:193: error: invalid initialization of non-const reference of type 'mat&' from a temporary of type 'mat'
0_0_12980877_21795.cpp:168: error: in passing argument 2 of `mat add(mat&, mat&)'


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