How can i get neighbors from 3D array but in the same order as the matrix ?

Hello,

How can i get neighbors from 3D array but in the same order as the matrix ?

for 2D array :

A =
0.6787    0.1712    0.0971    0.0344    0.1869
0.7577    0.7060    0.8235    0.4387    0.4898 
0.7431    0.0318    0.6948    0.3816    0.4456
0.3922    0.2769    0.3171    0.7655    0.6463
0.6555    0.0462    0.9502    0.7952    0.7094

the neighbors of A(3,3) are :

ngh = 
    0.7060    0.8235    0.4387
    0.0318    0.6948    0.3816
    0.2769    0.3171    0.7655

the matlab code is :

A =rand(5,5) ;
idx = sub2ind(size(A), 3,3);
M = size(VV,1);
Nidx = [idx-M-1 idx-1  idx+M-1;...
    idx-M idx idx+M; ...
    idx-M+1 idx+1 idx+M+1];
ngh = A(Nidx(:));
ngh = reshape(ngh,3,3);

Can you help me to get the same results in the case of 3D array … ?

Regards

[Abhay]

Dear Evan, Sorry for posting my query in the flagged content, actually when I was going through the flagged content I have found the query related to the generation of 3-d plot , I found a little connection of it with my previously asked problem, so in my eagerness I posted it there only, kindly forgive me for being a new user.

Answer 1

[Evan]

One way to do it:

A = rand(5,5,5);
B = false(size(A));
B(3,3,3) = true; %Point around which you want to find neighbors
mask = imdilate(B,ones(3,3,3));
ngh = reshape(A(mask),3,3,3)

[math lcn]

Even, Thank you for your answer.

but how can i get linear index of neighbors ?

[Evan]

ngh_idx = reshape(find(mask),3,3,3);