CENERALIZED POLAR DECOMPOSITION
广义极分解

By a generalized polar decomposition of an m×n matrix A, it is meant that A can bedecomposed as A=QH, where Q is an m×n subunitary matrix, and H is a Hermite positivesemidefinite matrix. In this paper, the uniqueness theorem of generalized polar decomposi-tiion, the best approximation property of the subunitary factor, the perturbation bounds forthe generalized polar factors Q and H, and a quadratically convergent method are studied. So-me numerical examples are also given.