#includeusing namespace cv; int main() { Mat mat(2, 3, CV_8UC1); std::cout << mat.cols << std::endl; return 0; }
#includeThis code creates a 3x4 matrix using the Eigen library and then prints the number of columns to the console, which is 4. Package library: Eigen Overall, C++ mat cols is a useful function for manipulating matrices in C++, and it is implemented in various packages such as OpenCV and Eigen.using namespace Eigen; int main() { MatrixXd mat(3, 4); std::cout << mat.cols() << std::endl; return 0; }