| Matrix properties | |
| number of rows | 1,280 |
| number of columns | 1,280 |
| nonzeros | 47,906 |
| structural full rank? | yes |
| structural rank | 1,280 |
| # of blocks from dmperm | 15 |
| # strongly connected comp. | 15 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 90% |
| numeric value symmetry | 31% |
| type | complex |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | A. Booten, M. Kooper, H. van der Vorst, S. Poedts, J. Goedbloed |
| editor | Z. Bai, D. Day, J. Demmel, J. Dongarra |
| date | 1994 |
| kind | electromagnetics problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 38,984 | 63,517 | 46,995 |
| Cholesky flop count | 1.3e+06 | 3.6e+06 | 1.8e+06 |
| nnz(L+U), no partial pivoting | 76,688 | 125,754 | 92,710 |
| nnz(V) for QR, upper bound nnz(L) for LU | 160,961 | 55,095 | 47,333 |
| nnz(R) for QR, upper bound nnz(U) for LU | 308,785 | 118,277 | 93,641 |
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.