This document provides with the expressions of simple matrices. The understanding of these matrices is of relevance for building more complex transformations. The transformation of a point, , or a vector, , do not involve matrix algebra, and their closed forms are given. For some applications, the logarithm of the matrix may be required, and their closed forms are provided as well. The and formulas were made-up from scratch, and I have no idea if these can be found in the litterature.