Split array into groups of close numbers

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Denis Perotto
Denis Perotto 2023-12-8
回答： Stephen23 2023-12-8
Greetings,
Is there a built-in function in MATLAB to split an 1D array into groups of close numbers?
For example, I have an array
a = [1 2 3 10 11]
and want to split it into N = 2 groups. I expect to see something like
result{1} = [1 2 3]
result{2} = [10 11]
  1 个评论
Dyuman Joshi
Dyuman Joshi 2023-12-8
How do you define close numbers?
Where the difference between adjacent numbers in 1?

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采纳的回答

Stephen23
Stephen23 2023-12-8
Ran in:
a = [1,2,3,10,11];
n = 2;
x = kmeans(a(:),n)
x = 5×1
2 2 2 1 1
c = accumarray(x,a(:),[],@(a){a})
c = 2×1 cell array
{2×1 double} {3×1 double}

更多回答（1 个）

Walter Roberson
Walter Roberson 2023-12-8
Ran in:
No -- because there is no rigourous meaning to what "close" means.
For example, in [1 3 5 7], surely 1 is not "close" to 7, but 5 is (probably) close to 7. Then 3 is "close" to 5, and 1 is "close" to 3. So are they all to be considered close as a group, even though 1 is "far" from 7 ?
Now, if the question were about dividing up into groups of consecutive values, then that would not be too difficult.
You could also use something like
N = 2;
a = [1 2 3 10 11]
a = 1×5
1 2 3 10 11
[g, centroids] = kmeans(a(:), N)
g = 5×1
1 1 1 2 2
centroids = 2×1
2.0000 10.5000

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