[FEATURE] Matrix computations

[tommens]

Describe the new functionality you would like to see
Provide support for matrix computations, where a matrix is an array of n * m numbers (in some given number domain, e.g. real numbers), with n and m strictly positive integer values. An 11 matrix is just a scalar value. An 1m matrix (with m>1) is a one-dimensional vector. The required functionality should include:

• A textual user interface to represent matrices and their computation. The textual representation could be based on brackets and commas, for example [[1,0],[0,1],[1,1]] for representing a 3*2 matrix (3 rows and 2 columns).
• A visual user interface to represent matrices and their computation.
• Addition, subtraction and multiplication of two matrices (of possibly different dimensions). In case of incompatible dimensions, appropriate error handling should be put into place.
• Computing the transposition and the inverse of a matrix.

Illustration
The figure below provides a possible illustration of what a visual interface for matrix representation and cumputation could look like.