I write these two programs (i.e. Coding and Decoding) for simplify, the operation for the user by using just :- array of different data (i.e. characters, real numbers, negative and positive numbers, zeros...etc).
The name of the submission is very misleading, as it suggests that you provide arithmetic encoding and decoding, while the functions call Matlab's arithenco/arithdeco functions and require Communications Systems Toolbox to work. This is a very simple frontend which could be programmed a lot better, using e.g. histc function.
