I started a new research. There are many situations which need mathematics. I am not good at mathematics, so I am really struggling. Particularly linear algebra makes me confused. I cannot imagine vector and matrix and the relation between them. There are two types of vectors, row vector and column vector. Whether a new vector represents which of them depends on the context. In many situations, I cannot recognize that, and it irritates me. I think it will take a long time to be accustomed to linear algebra.
