List of neighbors from adjacency matrix

    yourMatrix=[0  1  1  1
               1  0  0  1
               1  0  0  1
               1  1  1  0];
[i,j]=find(yourMatrix);
result = accumarray(i,j,[size(yourMatrix,1), 1],@(x) {sort(x).'});
 >> result{:}
      ans =
         2     3     4
    ans =
         1     4
    ans =
         1     4
    ans =
         1     2     3

6 个评论
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Nitika Kandhari 2018-3-1

在 MATLAB Online 中打开

I tried this:

for i = 1:length(result)
output(i,:)= cellstr(num2str(result{i,1}));
end

and I got 5 X 1 matrix as output:

'1  2'
'3   4   5   6   7'
'8   9  10  11  12  13  14  15  16'
'17  18  19  20  21  22  23  24  29  30  38  39  40  46'
'47  48  49  55  56  61  67  93  94  95  96'

Steven Lord 2018-3-1

You can't have a matrix in MATLAB where one row has 3 columns and another has 2 columns. You could try padding the shorter rows with missing data using either missing or NaN or padding with 0, but depending on what you want to do with this information it may be simpler just to use the cell array Matt's code creates.

If you tell us what you would do with such a neighbors matrix, we may be able to offer suggestions that will make your later processing easier.

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