  This report presents a brief review of matrix algebra and its implementation
in Julia for power and energy applications. First, we present basic examples of
data visualization, followed by conventional operations with matrices and
vectors. Then, we study quadratic forms and norms, two main concepts required
in the convergence study of the power flow in power and energy applications.
After that, we give good practices to create a neat code in Julia. There is an
extensive set of examples available on the Internet related to these basic
aspects, so we avoid repeating what is well documented. Hence, we show only
basic examples to create our first scripts.
