Geodesic
On some properties of the Laplacian matrix revealed by the RCM algorithm
Czechoslovak Mathematical Journal, Tome 66 (2016) no. 3, pp. 603-620.

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In this paper we present some theoretical results about the irreducibility of the Laplacian matrix ordered by the Reverse Cuthill-McKee (RCM) algorithm. We consider undirected graphs with no loops consisting of some connected components. RCM is a well-known scheme for numbering the nodes of a network in such a way that the corresponding adjacency matrix has a narrow bandwidth. Inspired by some properties of the eigenvectors of a Laplacian matrix, we derive some properties based on row sums of a Laplacian matrix that was reordered by the RCM algorithm. One of the theoretical results serves as a basis for writing an easy MATLAB code to detect connected components, by using the function ``symrcm'' of MATLAB. Some examples illustrate the theoretical results.
DOI : 10.1007/s10587-016-0281-y
Classification : 05C50, 15B36
Keywords: ordering algorithm; reverse Cuthill-McKee algorithm; graph partitioning; Laplacian matrix 
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Pedroche, Francisco; Rebollo, Miguel; Carrascosa, Carlos; Palomares, Alberto. On some properties of the Laplacian matrix revealed by the RCM algorithm. Czechoslovak Mathematical Journal, Tome 66 (2016) no. 3, pp. 603-620. doi : 10.1007/s10587-016-0281-y. http://geodesic.mathdoc.fr/articles/10.1007/s10587-016-0281-y/

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