ngraph.matrix

Module to transform ngraph.graph into matrix representation.

Note: This library is not supposed to be used for large graphs. It is only a demo for those who are interested in how certain graph matrix looks like.

Currently supported matrices:

• degree - diagonal matrix with node degree on the diagonal
• adjacency - matrix with (i, j) = 1 if node i is connected to j.
• laplacian - degree - adjacency matrix.

usage

E.g. let's comupte degree, adjacency and laplacian matrices for a complete graph K5 (five nodes, each connected with each other):

var create = require('ngraph.generators');
var getMatrix = require('ngraph.matrix');
var graph = create.complete(5);
 
printMatrix('degree', getMatrix.degree(graph));
printMatrix('adjacency', getMatrix.adjacency(graph));
printMatrix('laplacian', getMatrix.laplacian(graph));
 
function printMatrix(name, d) {
  console.log(name);
  for (var i = 0; i < d.shape[0]; ++i) {
    var str = '';
    for (var j = 0; j < d.shape[1] ; ++j) {
      str += d.get(i, j) + ' ';
    }
    console.log(str);
  }
}

The output will be:

degree
4 0 0 0 0 
0 4 0 0 0 
0 0 4 0 0 
0 0 0 4 0 
0 0 0 0 4 
adjacency
0 1 1 1 1 
1 0 1 1 1 
1 1 0 1 1 
1 1 1 0 1 
1 1 1 1 0 
laplacian
4 -1 -1 -1 -1 
-1 4 -1 -1 -1 
-1 -1 4 -1 -1 
-1 -1 -1 4 -1 
-1 -1 -1 -1 4 

install

With npm do:

npm install ngraph.matrix

license

MIT