| Matrix properties | |
| number of rows | 25,503 |
| number of columns | 25,503 |
| nonzeros | 1,140,977 |
| structural full rank? | yes |
| structural rank | 25,503 |
| # 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 | real |
| structure | symmetric |
| Cholesky candidate? | yes |
| positive definite? | no |
| author | R. Grimes |
| editor | T. Davis |
| date | 1995 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 2,815,563 | 3,056,296 |
| Cholesky flop count | 5.5e+08 | 6.2e+08 |
| nnz(L+U), no partial pivoting | 5,605,623 | 6,087,089 |
| nnz(V) for QR, upper bound nnz(L) for LU | 6,458,267 | 5,547,083 |
| nnz(R) for QR, upper bound nnz(U) for LU | 13,377,102 | 10,854,479 |
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.