Find nearest value to specific number

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Jens Keijser 2018-1-5

1
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https://ww2.mathworks.cn/matlabcentral/answers/375710-find-nearest-value-to-specific-number

评论： Andres Felipe 2023-12-1

Hello, I have an array with 20 values of steps per minute. I already know that the perfect outcome of one of these values is 33spm. But unfortunately 33spm is not in the array 34.8 is which is the closest to 33. What is the code to find the value closest to 33?

The ideal answer would be:

ClosestValue = 34.8

Could someone help me please?

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采纳的回答

Birdman 2018-1-5

22
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https://ww2.mathworks.cn/matlabcentral/answers/375710-find-nearest-value-to-specific-number#answer_298816

编辑：Birdman 2018-1-5

在 MATLAB Online 中打开

Try the following approach:

a=[34.8 31 29 26.7 39.5];%dummy data
n=33;
[val,idx]=min(abs(a-n));
minVal=a(idx)

Edit after Jan's warning(multiple values)

a=[34.8 31.2 29 26.7 39.5];%dummy data
n=33;
[~,~,idx]=unique(round(abs(a-n)),'stable');
minVal=a(idx==1)

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Umesh Gautam 2023-8-29

编辑：Umesh Gautam 2023-8-29

Thanks @Birdman, code is working great...even one can find the array of values.

Andres Felipe 2023-12-1

Thankss.

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更多回答（2 个）

Walter Roberson 2018-1-5

3
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https://ww2.mathworks.cn/matlabcentral/answers/375710-find-nearest-value-to-specific-number#answer_298817

Use interp1 with 'nearest'

Or since the vector is small abs() the difference between the probe and the fixed values and min() that and take the second output of min() and use that to index the fixed values. This is not as convenient as interp1 but should be faster