Your question does not many any sense. What is the meaning of "Rev" and "Imv". The real and imaginary parts of what? How can v have real and imaginary parts? Now, v is an element of R^2 and so you can think of "Rev" and "Imv" as the first and second components of v. However, even if you think that way then A(Rev) makes no sense. This is because A is a 2x2 matrix and Rev is just a number, it is not a matrix.