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Qu'est-ce (qui) est QR decomposition - définition
QR decomposition
MATRIX DECOMPOSITION
QR factorization; QR factorisation; LQ decomposition; RQ decomposition; QL decomposition; QRD; QR Factorization; Qr factorization; QR Decomposition; Qr decomposition; Qr Decomposition
In linear algebra, a QR decomposition, also known as a QR factorization or QU factorization, is a decomposition of a matrix A into a product A = QR of an orthogonal matrix Q and an upper triangular matrix R. QR decomposition is often used to solve the linear least squares problem and is the basis for a particular eigenvalue algorithm, the QR algorithm.
Lossless join decomposition
DECOMPOSITION OF A DATABASE RELATION SUCH THAT A NATURAL JOIN OF THE RESULTING RELATIONS YIELDS BACK THE ORIGINAL RELATION
Lossless-join decomposition; Lossless-Join Decomposition
In database design, a lossless join decomposition is a decomposition of a relation R into relations R_1, R_2 such that a natural join of the two smaller relations yields back the original relation. This is central in removing redundancy safely from databases while preserving the original data.
Chemical decomposition
BREAKDOWN OF A SINGLE ENTITY (NORMAL MOLECULE, REACTION INTERMEDIATE, ETC.) INTO TWO OR MORE FRAGMENTS; OPPOSITE OR REVERSE PROCESS OF A SYNTHESIS REACTION
Decomposition reaction; Decompose (chemistry); Chemical degradation; Chemical breakdown; Decomposition product; Decomposition (chemistry)
Chemical decomposition, or chemical breakdown, is the process or effect of simplifying a single chemical entity (normal molecule, reaction intermediate, etc.) into two or more fragments.
