MatrixPlot[m] generates a plot that gives a visual representation of the values of elements in a matrix.

AppendColumns, AppendRows, and BlockMatrix are available using the Mathematica kernel functions Join and ArrayFlatten. TakeRows, TakeColumns, TakeMatrix, and SubMatrix are ...

Matrix representations of graphs go back a long time and are still in some areas the only way to represent graphs. Adjacency matrices represent adjacent vertices and ...

Mathematica has special sparse-array technology for efficiently handling arrays with literally astronomical numbers of elements when only a small fraction of the elements are ...

ImageCooccurrence[image, n] gives the n*n co-occurrence matrix for image. ImageCooccurrence[image, n, ker] computes a co-occurrence matrix for arbitrary spatial relationships ...

GaborMatrix[r, k] gives a matrix that corresponds to the real part of a Gabor kernel of radius r and wave vector k. GaborMatrix[r, k, \[Phi]] uses phase shift \[Phi]. ...

Sparse representations of matrices are useful because they do not store every element. If one particular value appears very frequently, it can be very advantageous to use a ...

KirchhoffMatrix[g] gives the Kirchhoff matrix of the graph g.

ColorRules is an option for ArrayPlot which specifies how colors of cells should be determined from values.

IncidenceMatrix[g] gives the vertex-edge incidence matrix of the graph g.