| Article ID: | iaor19941067 |
| Country: | Italy |
| Volume: | 22 |
| Issue: | 63 |
| Start Page Number: | 63 |
| End Page Number: | 70 |
| Publication Date: | Sep 1993 |
| Journal: | Ricerca Operativa |
| Authors: | Spedicato Emilio |
| Keywords: | optimization |
A class of sparse symmetric matrices satisfying the Quasi-Newton equation is derived. The class contains a free parameter and there is no need of explicitly solving a sparse linear system as was the case for previous updates considered in the literature.