Why does adding a space give vertcat error?

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Although this works as expected
[1;1+1]
ans = 2×1
1 2
Inserting a space gives vertcat error for some reason
[1;1 +1]
Error using vertcat
Dimensions of arrays being concatenated are not consistent.
Why does this occur?

Accepted Answer

G A
G A on 10 Oct 2021
with a space, [1;1 +1] is interpreted as [1;1, +1]. [1;(1 +1)] will be OK.
  2 Comments
G A
G A on 10 Oct 2021
Edited: G A on 10 Oct 2021
I found that
[1 + 1; 1 + 1]
ans =
2
2
[1 +1; 1 +1]
ans =
1 1
1 1
[1+1; 1+1]
ans =
2
2
[1+ 1; 1+ 1]
ans =
2
2
the same behaviour if the second number is imaginary as 1i

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