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. Author manuscript; available in PMC: 2016 Oct 27.
Published in final edited form as: Mach Learn Med Imaging. 2011 Sep;7009:225–232. doi: 10.1007/978-3-642-24319-6_28

Fig. 3.

Fig. 3

A graph, the weights W and the graph Laplacian L. The weights are simply the adjacency matrix. The second eigenfunction ψ1 value is displayed in blue. (a) This example is given in [7]. The maximum geodesic distance is obtained between the nodes 1 and 3, which are also hot and cold spots. (b) In this example, there are two hot spots 1 and 5 which correspond to two maximal geodesic paths 1-4-2-3 and 5-4-2-3.