Numbering variables or structure fields is a bad idea. Any time you start naming things sequentially you need to think of using an array instead. Here, for example you'd be better off using a cell array. I.e use:
SATS_Hour = cell(23, 1); %instead of a structure
for idx = 1:23
SATS_Hour{idx} = ...
end
Indexing is always easier than awkward name construction via sprintf. If you're hell bent on using a structure:
for idx = 1:23
SATS_Hour.(sprintf('SATS_H%d', idx)) = ...
end
As you see, it's more complicated, less readable, and probably slower.
