简介:Censiderthesolutionsofthematrixinverseproblem,whicharesymmetricpositivesemidefiniteonasubspace.Necessaryandsufficientconditionsforthesolvability,aswellasthegeneralsolutionareobtained.Thebestapproximatesolutionbytheabovesolutionsetisgiven.Thustheopenproblemin[1]issolved.