A few things of note:
- struct is a very common matlab function, don't use this as a variable name regardless of its content.
- cell arrays and structure are two different container, so don't name a cell array struct or structure or anything that hints at structure. It's just plain confusing to anyone reading your code.
- Learn to use the end keyword. These two lines:
L = length(fID);
fName = fID(L-2:L);
are equivalent to:
fName = fID(end-2:end);
With that said, the cause of your problem is pretty simple. You're using k as an index to store values in your cell array, whereas your loop index is j. k never changes within your loop.
