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Matrix Decompositions

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Singular Value Decomposition (SVD)

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SVD factors a matrix into three matrices U, Σ, and V*, where U and V* are orthogonal and Σ is a diagonal matrix containing the singular values. It's used in signal processing and data compression.

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Jordan Decomposition

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Jordan Decomposition transforms a matrix into its Jordan normal form, which comprises Jordan blocks along the diagonal. It is useful in the theoretical study of linear differential equations.

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QR Decomposition

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QR Decomposition factors a matrix into an orthogonal matrix Q and an upper triangular matrix R. This decomposition is used in solving linear least squares problems and for eigenvalue computation.

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Cholesky Decomposition

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Cholesky Decomposition represents a Hermitian, positive-definite matrix as the product of a lower triangular matrix and its conjugate transpose. It's used in optimization and monte carlo simulations.

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Schur Decomposition

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Schur Decomposition factors a matrix into a unitary matrix Q and an upper triangular matrix T. All eigenvalues of the original matrix are located on the diagonal of T. It is used for matrix exponentiation and in control theory.

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LU Decomposition

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LU Decomposition factors a matrix as the product of a lower triangular matrix L and an upper triangular matrix U. It's used to solve linear equations, invert matrices, and compute determinants.

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Eigendecomposition

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Eigendecomposition decomposes a matrix into a product of its eigenvectors and eigenvalues. It's essential in principal component analysis and solving differential equations.

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Hessenberg Decomposition

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Hessenberg Decomposition converts a matrix into a Hessenberg form which resembles an upper triangular matrix, but has one additional nonzero line below the main diagonal. This form is useful for computing eigenvalues of a matrix.

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LDL Decomposition

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LDL Decomposition breaks down a Hermitian, positive-definite matrix into LDL*, where L is a lower triangular matrix with unit diagonal and D is a diagonal matrix. It's used for numerical methods in linear systems where pivoting is not desired.

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LQ Decomposition

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LQ Decomposition is a counterpart to the QR decomposition where a matrix is factored into a lower triangular matrix L and an orthogonal matrix Q. It is used in certain numerical linear algebra applications.

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Tridiagonal Decomposition

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Tridiagonal Decomposition is used predominantly for symmetric matrices, transforming them into a tridiagonal matrix that only has non-zero elements on the main diagonal and the first super and subdiagonals. It simplifies the calculation of eigenvalues.

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Matrix Diagonalization

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Matrix Diagonalization is a type of eigendecomposition where a matrix is expressed as the product of its eigenvectors and a diagonal matrix of eigenvalues, assuming it has a full set of distinct eigenvectors. It is widely used for matrix computations like powers and exponentials.

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Polar Decomposition

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Polar Decomposition factorizes a matrix into a unitary matrix and a positive semi-definite Hermitian matrix. It is used in areas such as quantum mechanics and robotics.

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Bidiagonal Decomposition

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Bidiagonal Decomposition reduces a matrix to a bidiagonal form, consisting of only the main diagonal and either the superdiagonal or the subdiagonal. It is a step in the process of computing SVD.

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LU with Partial Pivoting

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This decomposition is an adaptation of the LU decomposition that includes a permutation matrix to handle singularities and improve numerical stability. Applied in solving systems of equations that may have issues with straightforward LU decomposition.

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