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From: Qusai A on 11 Jun 2010 17:03
"us " <us(a)neurol.unizh.ch> wrote in message <griqqh$4ah$1(a)fred.mathworks.com>...
> "Marat"
> > I have a set of points (obtained using another tool) which I need to represent in the form of an adjacency matrix so that I can view the connectivity between these points. For e.g.
> > 5 2 6 9 4 7 3
> > 3 1 6 2 5 8 4
> > 2 3 5 1 4 6 5 % points represent a path
>
> one of the many solutions
>
> % the data
> v=[
> 5 2 6 9 4 7 3
> 3 1 6 2 5 8 4
> 2 3 5 1 4 6 5
> ];
> % the engine
> % - due to the anatomy of your V
> v=v.';
> v=reshape(v(:).',1,[]).';
> vm=max(v);
> am=accumarray([v(1:end-1),v(2:end)],1,[vm,vm]);
> vu=num2cell(unique(v));
> aml=[{nan},vu.';vu,num2cell(am)];
> % the result
> disp(am);
> disp(aml);
> %{
> % the raw adjacency mat
> 0 0 0 1 0 1 0 0 0
> 0 0 1 0 1 1 0 0 0
> 1 0 1 0 1 0 0 0 0
> 0 1 0 0 0 1 1 0 0
> 1 1 0 0 0 0 0 1 0
> 0 1 0 0 1 0 0 0 1
> 0 0 1 0 0 0 0 0 0
> 0 0 0 1 0 0 0 0 0
> 0 0 0 1 0 0 0 0 0
> % the labelled am
> [NaN] [1] [2] [3] [4] [5] [6] [7] [8] [9]
> [ 1] [0] [0] [0] [1] [0] [1] [0] [0] [0]
> [ 2] [0] [0] [1] [0] [1] [1] [0] [0] [0]
> [ 3] [1] [0] [1] [0] [1] [0] [0] [0] [0]
> [ 4] [0] [1] [0] [0] [0] [1] [1] [0] [0]
> [ 5] [1] [1] [0] [0] [0] [0] [0] [1] [0]
> [ 6] [0] [1] [0] [0] [1] [0] [0] [0] [1]
> [ 7] [0] [0] [1] [0] [0] [0] [0] [0] [0]
> [ 8] [0] [0] [0] [1] [0] [0] [0] [0] [0]
> [ 9] [0] [0] [0] [1] [0] [0] [0] [0] [0]
> %}
>
> us

Hi US,

I am trying to do something different here; I wonder if you can kindly help!!
I am trying to convert a an adjacency list into an adjacency matrix, so if i have the following adjacency list:
AL= 0 2 3 1
1 0 2
2 0 1 2
3 4 0
4 3
which represents an undirected graph for which the nodes 0,2,3,and 1 are connected. And nodes 1,0, and 2 are connected and so on.....
Then the Adjacency matrix should look like this:
AM= [
0 1 1 1 0
1 0 1 0 0
1 1 1 0 0
1 0 0 0 1
0 0 0 1 0 ]

I will do the same approach for a 64x64 matrix.

Many thanks in advance.
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