Find the two nearest points from an array given a value

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Nom 2019-10-8

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评论： Nom 2019-10-8

采纳的回答： Daniel M

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Hello,

Currently I have an 87x1 array called A.

I now have a value of 0.1400

What I want from A is the two nearest values to this number. In this case, it should be 0.1386 and 0.1444

I have the following code below which I have been trying to get to work:

k = dsearchn(A,0.1400)

This gives me 4 as the output which makes sense as the 4th row in array A has 0.1386 which is one of the closest.

However, how am I able to get the second closest of 0.1444?

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采纳的回答

Daniel M 2019-10-8

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https://ww2.mathworks.cn/matlabcentral/answers/484227-find-the-two-nearest-points-from-an-array-given-a-value#answer_395334

编辑：Daniel M 2019-10-8

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[~,k] = mink(abs(A-0.1400),2);

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Daniel M 2019-10-8

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Sorry, my hints were poor.

A = [0.1035
    0.1062
    0.1094
    0.1121
    0.1264
    0.1334
    0.1338
    0.1165];
res = A-0.1165;
res2 = res;
% find closest below
res(res>=0) = nan;
[~,kNeg] = max(res);
% find closest above
res2(res2<0) = nan;
[~,kPos] = min(res2);

Note how I handled it for when one value is A equals x (you can choose differently if you wish).

Nom 2019-10-8

Not at all, thank you for helping me out in this matter.

I apologize that I didn't catch on to the code, I really appreaciate this!

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