[vtkusers] Meaning of vtkAdjacencyMatrixToEdgeTable output

[Benoist Laurent]

Several assumptions:
     - the initial value 0 of your table is not stored.
     - the rows are given in inverse order of entry

The first column is therefore the column index of your matrix.
It results in


20  30  40
10  20  30
     10  20
--------------------
0   1   2    column index



So the pair is (column_index, value).
And the row index is given by the number of time you've ever seen the  
column index before (except for the 0 that increases the difficulty!).

Am I wrong ? Am I clear ? Does it answer your question ?

Benoist


Le 31 août 10 à 17:47, David Doria a écrit :

> Can anyone explain the output of this?
>
> http://www.vtk.org/Wiki/VTK/Examples/Cxx/Broken/Graphs/AdjacencyMatrixToEdgeTable
>
> The input array that I pass it is:
>
> 0 10 20
> 10 20 30
> 20 30 40
>
> and the output is:
>
>
> +-----------------+------------------+
> |                 | value            |
> +-----------------+------------------+
> | 2               | 20               |
> | 1               | 10               |
> | 2               | 30               |
> | 1               | 20               |
> | 0               | 10               |
> | 2               | 40               |
> | 1               | 30               |
> | 0               | 20               |
> +-----------------+------------------+
>
> The first column clearly has something to do with the row and column
> in the adjacency matrix (0 - 2, since it is a 3x3 matrix), but I don't
> understand what the pairs in this table indicate? For example, what is
> (2, 20)?
>
> Thanks,
>
> David
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