MATLAB: Neighbor searching

search neighbor matrix

Hello!
I have a meshgrid created like this:
x=1:10; y=1:10; [X Y]=meshgrid(x,y);
X =
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
     1     2     3     4     5     6     7     8     9    10
and
Y =
     1     1     1     1     1     1     1     1     1     1
     2     2     2     2     2     2     2     2     2     2
     3     3     3     3     3     3     3     3     3     3
     4     4     4     4     4     4     4     4     4     4
     5     5     5     5     5     5     5     5     5     5
     6     6     6     6     6     6     6     6     6     6
     7     7     7     7     7     7     7     7     7     7
     8     8     8     8     8     8     8     8     8     8
     9     9     9     9     9     9     9     9     9     9
    10    10    10    10    10    10    10    10    10    10
I would like to implement a neighbor searching as follow: – select one position (X=4,Y=5) – obtain as output the coordinates of the points close to the previous one; in the case of a matrix (for example) 1X1 this would be: 1) X=3 Y=4 2) X=4 Y=4 3) X=5 Y=4 4) X=3 Y=5 5) X=5 Y=5 6) X=3 Y=6 7) X=4 Y=6 8) X=5 Y=6
Is there any function that does that in matlab ?

Best Answer

I = zeros(10);
x = 4;
y = 5;
I(x,y) = 1;
[yout,xout] = find((bwdist(I,'chessboard') == 1)');
variant 2
x=1:10;
y=1:10;
[X Y]=meshgrid(x,y);
i1 = 4;
j1 = 5;
[yout,xout] = find(max(abs(X-i1),abs(Y-j1))' == 1);
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