| Matrix properties | |
| number of rows | 656 |
| number of columns | 656 |
| nonzeros | 3,884 |
| structural full rank? | yes |
| structural rank | 656 |
| # of blocks from dmperm | 2 |
| # strongly connected comp. | 2 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 99% |
| numeric value symmetry | 0% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | J. Cullum |
| editor | Z. Bai, D. Day, J. Demmel, J. Dongarra |
| date | 1986 |
| kind | 2D/3D problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 2,288 | 3,188 | 2,288 |
| Cholesky flop count | 9.4e+03 | 1.8e+04 | 9.4e+03 |
| nnz(L+U), no partial pivoting | 3,920 | 5,720 | 3,920 |
| nnz(V) for QR, upper bound nnz(L) for LU | 2,307 | 3,133 | 2,312 |
| nnz(R) for QR, upper bound nnz(U) for LU | 3,800 | 5,314 | 3,800 |
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.