MATLAB is an engineering environment that can do a whole myriad of complex calculations. It can help you plot graphs, process signals and can even help with sampling a signal.
According to Wikipedia,
MATLABĀ® is a numerical computing environment and programming language. Created by The MathWorks, MATLAB allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs in other languages. Although it specializes in numerical computing, an optional toolbox interfaces with the Maple symbolic engine, making it a full computer algebra system.
Personally, I have used it when I was studying for my Electrical & Computer Control Engineering degree, and have found it to be extremely useful! You have to learn its syntax, but that's easy because you can just refer to the program's help to find out more. I would definitely recommend this ahead of Excel and Fortran 90, as these are rather primitive and arcane methods for engineering purposes. C++ might provide added flexibility, but it cannot beat the power and the built-in functions of MATLAB.
Hope it helps! And good luck with your masters!!
MATLAB is a program, btw, that implements its own programming language.