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It looks like you are looking for the closest numbers where one is below 7 and one is above. If that is the case.
A = [2 3 5 6 9 10 23 45 100]'; num = 7; closest_below = max(A(A<num)); closest_above = min(A(A>num));
because otherwise, 5 is just as close to 7 as 9 is.
There are many possible ways to do this. Here is one way.
A = [2 3 5 6 9 10 23 45 100]';
v = 7;
idx_hi = find(A>7,1,'first');
twoClosest = A([idx_hi-1,idx_hi])
I assumed that your A vector was sorted, that all values are unique, etc. You want to be careful if these conditions are not met.
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