Is there a difference between a 1x3 structure array and a 3x1 structure array? From what I can see, there doesn't appear to be but I'm not entirely sure.
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1 Answer
Yes there is a difference, but it will only matter some of the time. This holds true for numeric arrays as well so I will use these in my examples below for brevity.
For linear indexing it won't matter whether for a row or column vector.
a = [4, 5, 6];
b = a.';
a(1) == b(1)
a(2) == b(2)
a(3) == b(3)
If you use two dimensions to index it though, it will matter.
% Will work
a(1, 3)
% Won't work
a(3, 1)
% Will Work
b(3, 1)
% Won't work
b(1, 3)
The biggest time it matters is when you go to combine it with another struct. The dimensions must allow for concatenation.
a = [1 2 3];
b = a.';
% Cannot horizontally concatenate something with 1 row with something with 3 rows
[a, b]
% You need to make sure they both have the same # of rows
[a, a] % or [a, b.']