Note that looping over lots of separate variable names is slow, complex, buggy, hard to debug, and is not recommended by the MATLAB documentation: "A frequent use of the eval function is to create sets of variables such as A1, A2, ..., An, but this approach does not use the array processing power of MATLAB and is not recommended. The preferred method is to store related data in a single array."
As David Fletcher showed and the MATLAB documentation reccomends, the best solution is to simply put all of your data into one numeric array, because this makes processing it trivially simple and very efficient. Accessing data using indexing is very efficient.
Read more here:
