Matrix: HB/ash958
Description: UNSYMMETRIC OVERDETERMINED PATTERN OF U.K. SURVEY. ASHKENAZI,1974
| Matrix properties | |
| number of rows | 958 |
| number of columns | 292 |
| nonzeros | 1,916 |
| structural full rank? | yes |
| structural rank | 292 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 0% |
| numeric value symmetry | 0% |
| type | binary |
| structure | rectangular |
| Cholesky candidate? | no |
| positive definite? | no |
| author | V. Askenazi |
| editor | A. Curtis, I. Duff, J. Reid |
| date | 1974 |
| kind | least squares problem |
| 2D/3D problem? | no |
| Ordering statistics: | AMD | METIS |
| nnz(V) for QR, upper bound nnz(L) for LU | 31,345 | 25,198 |
| nnz(R) for QR, upper bound nnz(U) for LU | 2,503 | 2,950 |
Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.