how to create adjacency matrix

How to create adjacency matrix 10 by 10 based on this developed commands

X=randi([1,1000],10,1); M=[X,X(randperm(length(X)))];

Whenever there is a common value in the matrix developed assign 1 in the matrix 10 by 10 else 0. (using for loop)

[Walter Roberson]

Please explain what you mean by "a common value" ?

For example for this M, what would you expect the result to be?

   575    84
   846   626
   739   730
   586   667
   247   586
   667   739
    84   661
   626   575
   661   247
   730   846

[chan]

This row represents nodes and column represent keys of the node.here there are 10 nodes and each node is having 2keys.here node1 1st column is having value 575 and 8th row 2nd column is having 575.thus node 1 is sharing key with node 8.so I ve to create an adjacency matrix 10 by 10.i ve to check all the rows keys which is common to node 1.

[Walter Roberson]

Then the code I provided in my Answer should do what you want.

[chan]

NO sir your code din't work.i have attached a file.the output will be like that based on that M matrix.In first row there are two 1's because node 1 is sharing key with 7 and 8.similarly i have to find for other nodes with whom they are sharing key.Sir could you please help in implementing this using for loop.thank you.

[Walter Roberson]

You did not attach a file.

When you used randperm() like that, each element will appear exactly once, and so node 1 should share "keys" with only one other node.

Read the adjacency matrix I created down the rows. Or reverse the order of the indices. Makes no difference to me.

Answer 1

[Walter Roberson]

My guess as to what you want is:

X = randi([1,1000],10,1);
idx = [(1:length(X)).', randperm(length(X)).'];
M = X(idx);
Adj = zeros(length(X),length(X));
Adj(sub2ind(size(Adj), idx(:,1), idx(:,2))) = 1;

That last line can be more efficiently written as

Adj(length(X)*(idx(:,2)-1)+idx(:,1)) = 1;