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The Gram–Schmidt process can be stabilized by a small modification; this version is sometimes referred to as modified Gram-Schmidt or MGS. This approach gives the same result as the original formula in exact arithmetic and introduces smaller errors in finite-precision arithmetic.
In other words, the sequence is obtained from the sequence of monomials 1, x, x 2, … by the Gram–Schmidt process with respect to this inner product. Usually the sequence is required to be orthonormal , namely, P n , P n = 1 , {\displaystyle \langle P_{n},P_{n}\rangle =1,} however, other normalisations are sometimes used.
In mathematics, the Iwasawa decomposition (aka KAN from its expression) of a semisimple Lie group generalises the way a square real matrix can be written as a product of an orthogonal matrix and an upper triangular matrix (QR decomposition, a consequence of Gram–Schmidt orthogonalization).
More generally, we can factor a complex m×n matrix A, with m ≥ n, as the product of an m×m unitary matrix Q and an m×n upper triangular matrix R.As the bottom (m−n) rows of an m×n upper triangular matrix consist entirely of zeroes, it is often useful to partition R, or both R and Q:
1 Gram-Schmidt orthonormalization process. Toggle the table of contents. Wikipedia: Featured picture candidates/Gram-Schmidt orthonormalization process. Add languages.
Jørgen Pedersen Gram (27 June 1850 – 29 April 1916) was a Danish actuary and mathematician who was born in Nustrup, Duchy of Schleswig, Denmark and died in Copenhagen, Denmark. Important papers of his include On series expansions determined by the methods of least squares , and Investigations of the number of primes less than a given number .
Magma as the functions LLL and LLLGram (taking a gram matrix) Maple as the function IntegerRelations[LLL] Mathematica as the function LatticeReduce; Number Theory Library (NTL) as the function LLL; PARI/GP as the function qflll; Pymatgen as the function analysis.get_lll_reduced_lattice; SageMath as the method LLL driven by fpLLL and NTL
$ tex Gram-Schmidt_process.tex && dvips -E Gram-Schmidt_process.dvi; Outline fonts $ eps2eps -dNOCACHE Gram-Schmidt_process.ps Gram-Schmidt_process2.eps; Fix bounding box $ ps2epsi Gram-Schmidt_process2.eps Gram-Schmidt_process.eps; Convert to Sketch $ pstoedit -f sk Gram-Schmidt_process.eps Gram-Schmidt_process.sk; Convert to SVG