"How can I create a loop that reads in data1, data2, without writing them all out?"
Read this to know why that would make slow, buggy, complicated code:
Or read what the MATLAB documentation says about that idea: "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"
And then use indexing, which is fast, simple, neat, easy to debug, easy to understand, etc, etc, and is exactly as recommended in the MATLAB documentation:
