| Matrix properties | |
| number of rows | 9 |
| number of columns | 9 |
| nonzeros | 50 |
| structural full rank? | yes |
| structural rank | 9 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 48% |
| numeric value symmetry | 48% |
| type | binary |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | J. Lewis |
| editor | I. Duff, R. Grimes, J. Lewis |
| date | 1983 |
| kind | counter-example problem |
| 2D/3D problem? | no |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 42 | 42 |
| Cholesky flop count | 2.4e+02 | 2.4e+02 |
| nnz(L+U), no partial pivoting | 75 | 75 |
| nnz(V) for QR, upper bound nnz(L) for LU | 44 | 44 |
| nnz(R) for QR, upper bound nnz(U) for LU | 45 | 45 |
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.