Check out example codes for "matrix multiplication c++ eigen". It will help you in understanding the concepts better.
Code Example 1
MatrixXcf a = MatrixXcf::Random(2,2); cout << "Here is the matrix a\n" << a << endl; cout << "Here is the matrix a^T\n" << a.transpose() << endl;
Code Example 2
Matrix2d mat; mat << 1, 2, 3, 4; std::cout << "Here is mat*mat:\n" << mat*mat << std::endl;
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