Supplement Matrix Method for Computing Eigenvalues of Dual Hermitian Matrices

Core Concepts

Practical method using supplement matrices to compute eigenvalues of dual Hermitian matrices.

Abstract

The study focuses on dual number symmetric matrices, dual complex Hermitian matrices, and dual quaternion Hermitian matrices within the framework of dual Hermitian matrices. The article introduces supplement matrices for a dual Hermitian matrix, which are Hermitian matrices in the original ring. By utilizing practical methods for computing eigenvalues of standard part Hermitian matrices in the original ring, a practical method is established for computing eigenvalues of a dual Hermitian matrix. Applications in low rank approximation, generalized inverses of dual matrices, least squares problems, and formation control are discussed with reported numerical experiments.

Stats

An n × n dual quaternion Hermitian matrix has n dual number eigenvalues.
Several numerical methods for computing eigenvalues of dual quaternion Hermitian matrices include a power method, bidiagonalization method, and Rayleigh quotient iteration method.
A unitary matrix V and U exist such that V ∗AU = Σt O O O where Σt is a diagonal matrix with appreciable and infinitesimal singular values.

Quotes

"The standard parts of the eigenvalues of that dual Hermitian matrix are the eigenvalues of the standard part Hermitian matrix in the original ring."
"Applications to low rank approximation and generalized inverses of dual matrices, dual least squares problem and formation control are discussed."
"We call this method the supplement matrix method."

Key Insights Distilled From

Supplement Matrix and a Practical Method for Computing Eigenvalues of a Dual Hermitian Matrix

by Liqun Qi,Chu... at arxiv.org 03-18-2024

https://arxiv.org/pdf/2403.10308.pdf

Deeper Inquiries

How can supplement matrices be applied to other types of matrices beyond those mentioned in the article?

Supplement matrices can be extended to various types of matrices, not limited to dual Hermitian matrices. One application is in the context of general symmetric or Hermitian matrices. By considering a standard part matrix and its corresponding supplement matrix, one can potentially compute eigenvalues for regular symmetric or complex Hermitian matrices efficiently. Additionally, this method could be adapted for non-Hermitian matrices by modifying the approach to suit the specific properties of these matrices.

What potential challenges or limitations could arise when using the supplement matrix method?

While the supplement matrix method offers a practical way to compute eigenvalues for dual Hermitian matrices, there are some challenges and limitations that may arise. One challenge is dealing with multiple eigenvalues in the standard part matrix, which can complicate finding accurate solutions using this method. Moreover, numerical stability issues might occur when working with infinitesimal elements within dual numbers, leading to potential inaccuracies in computations.

How might advancements in computational techniques impact the efficiency and accuracy of computing eigenvalues using this method?

Advancements in computational techniques such as improved algorithms for solving linear systems and optimized numerical methods could significantly enhance both efficiency and accuracy when computing eigenvalues using the supplement matrix method. These advancements would lead to faster computation times and more precise results, making it a more reliable approach for analyzing dual Hermitian matrices across various applications like low-rank approximation or formation control algorithms.