| Matrix properties | |
| number of rows | 512 |
| number of columns | 512 |
| nonzeros | 2,500 |
| structural full rank? | yes |
| structural rank | 512 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 97% |
| numeric value symmetry | 88% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | H. Dong |
| editor | Z. Bai, D. Day, J. Demmel, J. Dongarra |
| date | 1993 |
| kind | electromagnetics problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 5,362 | 6,064 |
| Cholesky flop count | 9.8e+04 | 1.3e+05 |
| nnz(L+U), no partial pivoting | 10,212 | 11,616 |
| nnz(V) for QR, upper bound nnz(L) for LU | 6,941 | 9,146 |
| nnz(R) for QR, upper bound nnz(U) for LU | 12,893 | 16,740 |
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.