Approximate factorization of multivariate polynomials using singular value decomposition

We describe the design, implementation and experimental evaluation of new algorithms for computing the approximate factorization of multivariate polynomials with complex coefficients that contain numerical noise. Our algorithms are based on a generalization of the differential forms introduced by W. Ruppert and S. Gao to many variables, and use singular value decomposition or structured total least squares approximation and Gauss-Newton optimization to numerically compute the approximate multivariate factors. We demonstrate on a large set of benchmark polynomials that our algorithms efficiently yield approximate factorizations within the coefficient noise even when the relative error in the input is substantial (10-3). Key words: multivariate polynomial factorization, approximate factorization, singular value decomposition, numerical algebra, Gauss-Newton optimization

• Type: Journal
• Year: 2008
• Where: JSC
• Authors: Erich Kaltofen, John P. May, Zhengfeng Yang, Lihong Zhi
• Keywords: Approximate Factorization, JSC 2008, Multivariate Polynomial, Singular Value Decomposition