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ISSAC
2007
Springer
105views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Certification of the QR factor R and of lattice basis reducedness
Given a lattice basis of n vectors in Zn, we propose an algorithm using 12n3 + O(n2) floating point operations for checking whether the basis is LLL-reduced. If the basis is redu...
Gilles Villard
ISSAC
2007
Springer
111views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Numerical optimization in hybrid symbolic-numeric computation
Approximate symbolic computation problems can be formulated as constrained or unconstrained optimization problems, for example: GCD [3, 8, 12, 13, 23], factorization [5, 10], and ...
Lihong Zhi
ISSAC
2007
Springer
130views Mathematics» more  ISSAC 2007»
14 years 3 months ago
On probabilistic analysis of randomization in hybrid symbolic-numeric algorithms
Algebraic randomization techniques can be applied to hybrid symbolic-numeric algorithms. Here we consider the problem of interpolating a sparse rational function from noisy values...
Erich Kaltofen, Zhengfeng Yang, Lihong Zhi
ISSAC
2007
Springer
99views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Computing monodromy via parallel homotopy continuation
Numerical homotopy continuation gives a powerful tool for the applied scientist who seeks solutions to a system of polynomial equations. Techniques from numerical homotopy continu...
Anton Leykin, Frank Sottile
ISSAC
2007
Springer
162views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Multiprocessed parallelism support in ALDOR on SMPs and multicores
We report on a high-level categorical parallel framework, written in the Aldor language, to support high-performance computer algebra on symmetric multi-processors and multicore p...
Marc Moreno Maza, Ben Stephenson, Stephen M. Watt,...
ISSAC
2007
Springer
94views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Faster algorithms for the characteristic polynomial
A new randomized algorithm is presented for computing the characteristic polynomial of an n × n matrix over a field. Over a sufficiently large field the asymptotic expected com...
Clément Pernet, Arne Storjohann
ISSAC
2007
Springer
142views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Fast arithmetic for triangular sets: from theory to practice
We study arithmetic operations for triangular families of polynomials, concentrating on multiplication in dimension zero. By a suitable extension of fast univariate Euclidean divi...
Xin Li, Marc Moreno Maza, Éric Schost
ISSAC
2007
Springer
108views Mathematics» more  ISSAC 2007»
14 years 3 months ago
Minimum converging precision of the QR-factorization algorithm for real polynomial GCD
Shirayanagi and Sweedler proved that a large class of algorithms over the reals can be modified slightly so that they also work correctly on fixed-precision floating-point numb...
Pramook Khungurn, Hiroshi Sekigawa, Kiyoshi Shiray...