Minimizing the Cayley transform of an orthogonal matrix by multiplying by signature matrices
Minimizing the Cayley transform of an orthogonal matrix by multiplying by signature matrices
复制标题
通过乘以签名矩阵来最小化正交矩阵的凯莱变换
DOI:
10.1016/j.laa.2014.01.032
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发表时间:
2014
影响因子:
1.1
通讯作者:
Evan M. O’Dorney
中科院分区:
文献类型:
--
作者:
Evan M. O’Dorney
Abstract The Cayley transform, $(A)=(I− A)(I+ A)− 1, maps skew-symmetric matrices to orthogonal matrices and vice versa. Given an orthogonal matrix Q, we can choose a diagonal matrix D with each diagonal entry±1 (a signature matrix) and, if I+ Q D is nonsingular, calculate the skew-symmetric matrix $(Q D). An open problem is to show that, by a suitable choice of D, we can make every entry of $(Q D) less than or equal to 1 in absolute value. We solve this problem by showing that the principal minors of $(Q D) are related in a simple way to the principal minors of $(Q).