2 nearest neighbors of each side of vector

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eden kisos
eden kisos 2019-11-17
评论： eden kisos 2019-11-17
I have two vectors:
A= 2 8 3 6 1 9 5 4 3 7 10 %ranperm(10)
i=1:10
I would like to find for every i , the two closest neighbors of each side.
For example:
for i=1
neighbors= 2,8
for i=2
neighbors= 2,3,6
for i=3
neighbors= 2,8,6,1
for i=10
neighbors= 4,3
...

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采纳的回答

Image Analyst
Image Analyst 2019-11-17
This will do it:
A= [2 8 3 6 1 9 5 4 3 7 10] %ranperm(10)
for k = 1 : length(A)
firstIndex = max(k-1, 1);
lastIndex = min(k+1, length(A));
neighbors{k} = A(firstIndex:lastIndex);
end
celldisp(neighbors) % Display in command window.
  1 个评论
eden kisos
eden kisos 2019-11-17
I'm sorry, but I made a mistake. I'll write it down again.
A= 2 8 3 6 1 9 5 4 7 10 %ranperm(10)
i=1:10
I would like to find for every i , the two closest neighbors of each side.
For example:
for i=1
neighbors= 8,3
for i=2
neighbors= 2,3,6
for i=3
neighbors= 2,8,6,1
for i=10
neighbors= 4,7

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更多回答（1 个）

Steven Lord
Steven Lord 2019-11-17
Are there specific operations you want to perform on those neighbors? The moving statistics functions on this documentation page may perform those operations directly (if you want to add them see movsum, for example) or serve as building blocks to help you perform those operations.
  1 个评论
eden kisos
eden kisos 2019-11-17
thank you, I am making some modifications to what is being received but the rest I already know how to do. I got stuck with the neighbors (especially the edges)

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