Matrix Calculator pro is a calculator of matrices! Very much aimed at mathematicians this calculator comes with absolutely no explanation of what it's for!
There is a manual included, but it's extremely short, just telling the user how to enter information, and what equations will be calculated. Basically, you enter a number in each of the matrices, A and B, and Matrix Calculator pro will automatically perform various equations with them. There are 43 automated equations, and the results are displayed in the right hand panel.
While it's not hard to use, Matrix Calculator pro seems a very limited calculator. You can't add your own equations, which means unless you regularly need one of those supplied, it's kind of useless.
Matrix Calculator pro is very much a niche product, and it's neither very flexible nor does it have a user friendly interface.