Opencv multiply scalar and matrix

Question

I have been trying to achieve something which should pretty trivial and is trivial in Matlab.

I want to simply achieve something such as:

cv::Ma         


        

Answer 1

For big Mats you should use forEach.

If C++11 is available:

m.forEach([&](double& element, const int position[]) -> void
{
element *= 5;
}
);