| Matrix properties | |
| number of rows | 443 |
| number of columns | 443 |
| nonzeros | 1,623 |
| structural full rank? | yes |
| structural rank | 443 |
| # 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 | B. Dembart, J. Lewis |
| editor | I. Duff, R. Grimes, J. Lewis |
| date | 1981 |
| kind | power network problem |
| 2D/3D problem? | no |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 1,414 | 1,567 |
| Cholesky flop count | 5.3e+03 | 7.6e+03 |
| nnz(L+U), no partial pivoting | 2,385 | 2,691 |
| nnz(V) for QR, upper bound nnz(L) for LU | 1,969 | 2,215 |
| nnz(R) for QR, upper bound nnz(U) for LU | 3,803 | 4,347 |
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.