(manually rotated version; click the image to see Yifan Hu's original).
| Matrix properties | |
| number of rows | 7,920 |
| number of columns | 7,920 |
| nonzeros | 31,680 |
| structural full rank? | yes |
| structural rank | 7,920 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | symmetric |
| type | binary |
| structure | symmetric |
| Cholesky candidate? | yes |
| positive definite? | no |
| author | NASA |
| editor | G. Kumfert, A. Pothen |
| date | 2003 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Additional fields | size and type |
| coord | full 7920-by-3 |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 75,492 | 86,482 |
| Cholesky flop count | 1.6e+06 | 2.0e+06 |
| nnz(L+U), no partial pivoting | 143,064 | 165,044 |
| nnz(V) for QR, upper bound nnz(L) for LU | 133,108 | 147,703 |
| nnz(R) for QR, upper bound nnz(U) for LU | 248,755 | 274,619 |
Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.