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Adjacency matrix information


In graph theory and computer science, an adjacency matrix is a square matrix used to represent a finite graph. The elements of the matrix indicate whether pairs of vertices are adjacent or not in the graph.

In the special case of a finite simple graph, the adjacency matrix is a (0,1)-matrix with zeros on its diagonal. If the graph is undirected (i.e. all of its edges are bidirectional), the adjacency matrix is symmetric. The relationship between a graph and the eigenvalues and eigenvectors of its adjacency matrix is studied in spectral graph theory.

The adjacency matrix of a graph should be distinguished from its incidence matrix, a different matrix representation whose elements indicate whether vertex–edge pairs are incident or not, and its degree matrix, which contains information about the degree of each vertex.

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Adjacency matrix

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the adjacency matrix is a (0,1)-matrix with zeros on its diagonal. If the graph is undirected (i.e. all of its edges are bidirectional), the adjacency matrix...

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Laplacian matrix

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matrix for the latter. In the matrix notation, the adjacency matrix of the undirected graph could, e.g., be defined as a Boolean sum of the adjacency...

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Adjacency list

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science, an adjacency list is a collection of unordered lists used to represent a finite graph. Each unordered list within an adjacency list describes...

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Seidel adjacency matrix

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mathematics, in graph theory, the Seidel adjacency matrix of a simple undirected graph G is a symmetric matrix with a row and column for each vertex, having...

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Degree matrix

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adjacency matrix to construct the Laplacian matrix of a graph: the Laplacian matrix is the difference of the degree matrix and the adjacency matrix....

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Incidence matrix

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variations; see below. Incidence matrix is a common graph representation in graph theory. It is different to an adjacency matrix, which encodes the relation...

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Characteristic polynomial

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characteristic polynomial of a graph is the characteristic polynomial of its adjacency matrix. In linear algebra, eigenvalues and eigenvectors play a fundamental...

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Spectral clustering

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of the normalized adjacency matrix, without even talking about the Laplacian matrix. Naive constructions of the graph adjacency matrix, e.g., using the...

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Design structure matrix

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representation of a system or project in the form of a square matrix. It is the equivalent of an adjacency matrix in graph theory, and is used in systems engineering...

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Centrality

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that powers of the graph's adjacency matrix gives the number of walks of length given by that power. Similarly, the matrix exponential is also closely...

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Google matrix

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irreducible and aperiodic. In order to generate the Google matrix G, we must first generate an adjacency matrix A which represents the relations between pages or...

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Eigenvector centrality

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|V|} vertices let A = ( a v , t ) {\displaystyle A=(a_{v,t})} be the adjacency matrix, i.e. a v , t = 1 {\displaystyle a_{v,t}=1} if vertex v {\displaystyle...

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Sparse matrix

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sparse matrix arises as the adjacency matrix of an undirected graph; it can be stored efficiently as an adjacency list. A block-diagonal matrix consists...

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Spectral graph theory

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graph, such as its adjacency matrix or Laplacian matrix. The adjacency matrix of a simple undirected graph is a real symmetric matrix and is therefore orthogonally...

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Graph neural network

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matrix X {\displaystyle \mathbf {X} } of node features, and the graph adjacency matrix A {\displaystyle \mathbf {A} } . The output is the new matrix X...

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List of named matrices

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adjacency matrix — a matrix similar to the usual adjacency matrix but with −1 for adjacency; +1 for nonadjacency; 0 on the diagonal. Skew-adjacency matrix...

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Hermitian matrix

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Hermitian Laplacian matrix is a key tool in this context, as it is used to analyze the spectra of mixed graphs. The Hermitian-adjacency matrix of a mixed graph...

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Matrix of ones

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graph theory. For example, if A is the adjacency matrix of an n-vertex undirected graph G, and J is the all-ones matrix of the same dimension, then G is a...

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Katz centrality

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( 0.5 ) 4 = 0.0625 {\displaystyle (0.5)^{4}=0.0625} . Let A be the adjacency matrix of a network under consideration. Elements ( a i j ) {\displaystyle...

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Hypergraph

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adjacency matrix of a hypergraph can be drawn from the adjacency matrix of a graph. In the case of a graph, the adjacency matrix is a square matrix which...

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Strongly regular graph

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follows. Let I denote the identity matrix and let J denote the matrix of ones, both matrices of order v. The adjacency matrix A of a strongly regular graph...

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Hypercube graph

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constructing the adjacency matrix of a hypercube, An. Copying is done via the Kronecker product, so that the two copies of Qn − 1 have an adjacency matrix 1 2 ⊗...

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Graphon

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{\displaystyle \{1,2,\dots ,n\}} can be identified with its adjacency matrix A G {\displaystyle A_{G}} . This matrix corresponds to a step function W G : [ 0 , 1 ]...

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