摘要
令S={A∈Rn×m|f1(A)=‖AX1-Z1‖2+‖YT1A-WT1‖2=min},其中X1∈Rm×k1,Z1∈Rn×k1,Y1∈Rn×11和W1∈Rm×11均为给定的矩阵,‖·‖是Frobenius范数。本文考虑如下问题:问题Ⅰ给定X2∈Rm×k2,Z2∈Rn×k2,Y2∈Rn×l2,W2∈Rm×l2,求A∈S,使得f2(A)=‖AX2-Z2‖2+‖YT2A-WT2‖2=min.问题Ⅱ给定A∈Rn×m,求A∈SA,使得‖A-A‖=infA∈SA‖A-A‖,其中SA是问题I的解集合。本文给出问题I解集合SA的通式和问题Ⅱ的解A的表达式,提出了求解问题Ⅰ与Ⅱ的数值方法。许多文献的结果都是本文结果的特例。
Let S={A∈Rn×m|f1(A)=||AX1-Z1||2+||YT1A-WT1||2=min},where X1∈Rm×kZ1∈Rn×k,Y1∈Rn×l1 and W1∈Rm×l1 are given,||·|| is the Frobenius norm. We consider the following probems:Problem Ⅰ Given X2∈Rm×k2,Z2∈Rn×k2,Y2∈Rn×l2 and W2∈Rm×l2,find A∈S such that f2(A)=||AX2-Z2||2+||YT2A-WT2||2=min. Problem Ⅱ Given A ∈Rn×m,find A∈SA such that where SA is the solution set of the Problem I.The general form of the solution set SA of the Problem I is given.The expression of the solution A of the Problem Ⅱis presented.A practical procedure for computing A is provided.Many available results could be subsumed in the cases proposed in this paper.
出处
《高校应用数学学报(A辑)》
CSCD
北大核心
1994年第3期312-320,共9页
Applied Mathematics A Journal of Chinese Universities(Ser.A)
基金
国家自然科学基金
关键词
矩阵
最佳逼近
特征值
流形
线性
Numerical Linear Algebra
Matrix
Best Approximation
Eigenvalue
In verse Problem.