# 2 nearest neighbors of each side of vector

2 views (last 30 days)
eden kisos on 17 Nov 2019
Commented: eden kisos on 17 Nov 2019
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
...

Image Analyst on 17 Nov 2019
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 Comment

eden kisos on 17 Nov 2019
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

Steven Lord on 17 Nov 2019
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 Comment

eden kisos on 17 Nov 2019
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)