Dynamic Normal Forms and Dynamic Characteristic Polynomial

Authors

  • Gudmund Skovbjerg Frandsen
  • Piotr Sankowski

DOI:

https://doi.org/10.7146/brics.v15i2.21937

Abstract

We present the first fully dynamic algorithm for computing the characteristic polynomial of a matrix. In the generic symmetric case our algorithm supports rank-one updates in O(n^2 log n) randomized time and queries in constant time, whereas in the general case the algorithm works in O(n^2 k log n) randomized time, where k is the number of invariant factors of the matrix. The algorithm is based on the first dynamic algorithm for computing normal forms of a matrix such as the Frobenius normal form or the tridiagonal symmetric form. The algorithm can be extended to solve the matrix eigenproblem with relative error 2^{-b} in additional O(n log^2 n log b) time. Furthermore, it can be used to dynamically maintain the singular value decomposition (SVD) of a generic matrix. Together with the algorithm the hardness of the problem is studied. For the symmetric case we present an Omega(n^2) lower bound for rank-one updates and an Omega(n) lower bound for element updates.

Downloads

Published

2008-04-12

How to Cite

Frandsen, G. S., & Sankowski, P. (2008). Dynamic Normal Forms and Dynamic Characteristic Polynomial. BRICS Report Series, 15(2). https://doi.org/10.7146/brics.v15i2.21937