Square matrix used to represent a graph or network
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.
the adjacencymatrix 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...
matrix for the latter. In the matrix notation, the adjacencymatrix of the undirected graph could, e.g., be defined as a Boolean sum of the adjacency...
science, an adjacency list is a collection of unordered lists used to represent a finite graph. Each unordered list within an adjacency list describes...
mathematics, in graph theory, the Seidel adjacencymatrix of a simple undirected graph G is a symmetric matrix with a row and column for each vertex, having...
variations; see below. Incidence matrix is a common graph representation in graph theory. It is different to an adjacencymatrix, which encodes the relation...
characteristic polynomial of a graph is the characteristic polynomial of its adjacencymatrix. In linear algebra, eigenvalues and eigenvectors play a fundamental...
of the normalized adjacencymatrix, without even talking about the Laplacian matrix. Naive constructions of the graph adjacencymatrix, e.g., using the...
representation of a system or project in the form of a square matrix. It is the equivalent of an adjacencymatrix in graph theory, and is used in systems engineering...
that powers of the graph's adjacencymatrix gives the number of walks of length given by that power. Similarly, the matrix exponential is also closely...
irreducible and aperiodic. In order to generate the Google matrix G, we must first generate an adjacencymatrix A which represents the relations between pages or...
|V|} vertices let A = ( a v , t ) {\displaystyle A=(a_{v,t})} be the adjacencymatrix, i.e. a v , t = 1 {\displaystyle a_{v,t}=1} if vertex v {\displaystyle...
sparse matrix arises as the adjacencymatrix of an undirected graph; it can be stored efficiently as an adjacency list. A block-diagonal matrix consists...
graph, such as its adjacencymatrix or Laplacian matrix. The adjacencymatrix of a simple undirected graph is a real symmetric matrix and is therefore orthogonally...
matrix X {\displaystyle \mathbf {X} } of node features, and the graph adjacencymatrix A {\displaystyle \mathbf {A} } . The output is the new matrix X...
adjacencymatrix — a matrix similar to the usual adjacencymatrix but with −1 for adjacency; +1 for nonadjacency; 0 on the diagonal. Skew-adjacency matrix...
Hermitian Laplacian matrix is a key tool in this context, as it is used to analyze the spectra of mixed graphs. The Hermitian-adjacencymatrix of a mixed graph...
graph theory. For example, if A is the adjacencymatrix of an n-vertex undirected graph G, and J is the all-ones matrix of the same dimension, then G is a...
( 0.5 ) 4 = 0.0625 {\displaystyle (0.5)^{4}=0.0625} . Let A be the adjacencymatrix of a network under consideration. Elements ( a i j ) {\displaystyle...
adjacencymatrix of a hypergraph can be drawn from the adjacencymatrix of a graph. In the case of a graph, the adjacencymatrix is a square matrix which...
follows. Let I denote the identity matrix and let J denote the matrix of ones, both matrices of order v. The adjacencymatrix A of a strongly regular graph...
constructing the adjacencymatrix of a hypercube, An. Copying is done via the Kronecker product, so that the two copies of Qn − 1 have an adjacencymatrix 1 2 ⊗...
{\displaystyle \{1,2,\dots ,n\}} can be identified with its adjacencymatrix A G {\displaystyle A_{G}} . This matrix corresponds to a step function W G : [ 0 , 1 ]...