For an existing vector x, you can assign a new element to the end using direct indexing. For example
x = [1 2 3]
x(4) = 4
or
x(end+1) = 4;
where "end" is a special keyword in MATLAB that means the last index in the array. So in your specific case of n elements, it would automatically know that "end" is your "n".
Another way to add an element to a row vector “x” is by using concatenation:
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