Dynamically defining or accessing variable names is one way that beginners force themselves into writing slow, complex, obfuscated, buggy, hard-to-debug code. Read this to know why:
Not only that, but the including meta-data into variable names or fieldnames makes code slow, complex, and fragile. Read this to know why:
In your case you can easily write much simpler, neater, more efficient code, just like experienced MATLAB users would:
>> u = 3;
>> M = [1,8,6,2,4];
>> N = [2,3,7,8,12];
>> V = u.^(1:numel(N))
V =
3 9 27 81 243
and just then use basic MATLAB indexing to access the corresponding vector elements. Indexing is simple, neat, easy to debug, and very efficient (unlike what you are trying to do).
