| Matrix properties | |
| number of rows | 54,924 |
| number of columns | 54,924 |
| nonzeros | 2,962,152 |
| structural full rank? | yes |
| structural rank | 54,924 |
| # 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 | C. Damhaug |
| editor | N. Gould, Y. Hu, J. Scott |
| date | 2004 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 9,801,174 | 10,417,638 |
| Cholesky flop count | 3.0e+09 | 3.5e+09 |
| nnz(L+U), no partial pivoting | 19,547,424 | 20,780,352 |
| nnz(V) for QR, upper bound nnz(L) for LU | 18,591,978 | 16,905,702 |
| nnz(R) for QR, upper bound nnz(U) for LU | 36,881,058 | 32,125,350 |
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.