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cfjunior

Values closest to a number

Asked by cfjunior
on 27 Apr 2013

How do I find the two closest numbers from a number in a vector column? For example, suppose I have:

A = [2 3 5 6 9 10 23 45 100]';

If the number I'm seaching is 7, my requested answer would be 6 and 9.

  1 Comment

bym
on 27 Apr 2013

why wouldn't it return 5 & 6? 5 is as close as 9

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2 Answers

Answer by Wayne King
on 27 Apr 2013
Edited by Wayne King
on 27 Apr 2013
 Accepted answer

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.

  1 Comment

cfjunior
on 27 Apr 2013

Yes, thats what I need!! Thanks a lot!!


Answer by the cyclist
on 27 Apr 2013

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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