Machine Learning, Artificial Intelligence, Data Science.
exist. But yet, pseudoinverse (keep the inverse of 0 as 0) can be used as a substitute in some methods. Orthogonal matrix An orthogonal matrix Q is a square matrix that fulfills the following requirement. All the columns (v₁, …, vᵢ , …) in Q are orthonormal, i.e. vᵢᵀ vⱼ =0 for i≠j and vᵢ are all