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en.wikipedia.org/wiki/Diagonal_matrix

In linear algebra, a diagonal matrix is a matrix in which the entries outside the main diagonal are all zero. The term usually refers to square matrices.An example of a 2-by-2 diagonal matrix is []; the following matrix is a 3-by-3 diagonal matrix: [].An identity matrix of any size, or any multiple of it, will be a diagonal matrix.

dictionary.cambridge.org/dictionary/english/diagonal-matrix

Diagonal matrix is in our corpus but we don't have a definition yet. These example sentences show you how diagonal matrix is used. These examples are from the Cambridge English Corpus and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary ...

stackoverflow.com/questions/38446079/diagonal-matrix-in-matlab

I am having trouble creating this matrix in matlab, basically I need to create a matrix that has -1 going across the center diagonal followed be 4s on the diagonal outside of that (example below). ...

yutsumura.com/how-to-diagonalize-a-matrix-step-by-step...

We explain how to diagonalize a matrix if possible. Step by step procedure of the diagonalization together with an example is given. New problems are added.

stattrek.com/.../dictionary.aspx?definition=Diagonal_matrix

Diagonal Matrix. A diagonal matrix matrix is a special kind of symmetric matrix.It is a symmetric matrix with zeros in the off-diagonal elements. Two diagonal matrices are shown below.

www.mathworks.com/help/matlab/ref/diag.html

For variable-size inputs that are not variable-length vectors (1-by-: or :-by-1), diag treats the input as a matrix from which to extract a diagonal vector. This behavior occurs even if the input array is a vector at run time.

www.cps.brockport.edu/~little/matlin/node25.html

Diagonal matrices are matrices that seem to have their elements aligned along the diagonals of the matrix. For example, is a tridiagonal matrix. The main diagonal of a matrix consists of those elements where the row and column are equal.

en.wikipedia.org/wiki/Tridiagonal_matrix

In linear algebra, a tridiagonal matrix is a band matrix that has nonzero elements only on the main diagonal, the first diagonal below this, and the first diagonal above the main diagonal. For example, the following matrix is tridiagonal: (). The determinant of a tridiagonal matrix is given by the continuant of its elements.