How to find vector components limiting a value?

Hello,

Say A=[2;4;7;9;11;15].

How do you find the components (indices) of A which are limiting a value, say k=10?

In this case, it is easy to see that A(4) and A(5) are the limiting components, i.e, k is in between 9 and 11: A(4)<k<A(5). My actual A is much bigger.

Thanks!

Answer 1

[the cyclist]

If your vector is guaranteed to be in sorted order, as in your example, then

max(find(a<k))

and

min(find(a>k))

will give the two limits.

You might want to make one of those include the equality, in case it might be exactly equal to the border. Also, you really only need to calculate, say, the lower limit, and then the other limit is just the next index.

Finally, you might need to consider what to do if all values in the vector are above (or below) the value of k.