MATLAB: Trying to go from 1 matrix to a structure with a condition in the next column

Answer 1

I want to make a struct with the first column stating the values in the 1x996 matrix and the second column stating if the number from the first column is critical or not critical.

I can't tell what you mean by "struct". It sounds like what you really want is a 2x966 matrix,

result=[A(:), A(:)<1.5];