# Shifted Power Method for Computing Tensor Eigenpairs

### Abstract

Recent work on eigenvalues and eigenvectors for tensors of order m >= 3 has been motivated by applications in blind source separation, magnetic resonance imaging, molecular conformation, and more. In this paper, we consider methods for computing real symmetric-tensor eigenpairs of the form Ax^{m-1} = \lambda x subject to |x|=1, which is closely related to optimal rank-1 approximation of a symmetric tensor. Our contribution is a shifted symmetric higher-order power method (SS-HOPM), which we show is guaranteed to converge to a tensor eigenpair. SS-HOPM can be viewed as a generalization of the power iteration method for matrices or of the symmetric higher-order power method. Additionally, using fixed point analysis, we can characterize exactly which eigenpairs can and cannot be found by the method. Numerical examples are presented, including examples from an extension of the method to finding complex eigenpairs.

Type
Publication
SIAM Journal on Matrix Analysis and Applications
Date
Tags
Citation
T. G. Kolda, J. R. Mayo. Shifted Power Method for Computing Tensor Eigenpairs. SIAM Journal on Matrix Analysis and Applications, Vol. 32, No. 4, pp. 1095-1124, 2011. https://doi.org/10.1137/100801482

### Keywords

tensor eigenvalues, E-eigenpairs, Z-eigenpairs, l2-eigenpairs, rank-1 approximation, symmetric higher-order power method (S-HOPM), shifted symmetric higher-order power method (SS-HOPM)

### BibTeX

@article{KoMa11,
author = {Tamara G. Kolda and Jackson R. Mayo},
title = {Shifted Power Method for Computing Tensor Eigenpairs},
journal = {SIAM Journal on Matrix Analysis and Applications},
volume = {32},
number = {4},
pages = {1095-1124},
month = {October},
year = {2011},
doi = {10.1137/100801482},
}