| Matrix properties | |
| number of rows | 3,083 |
| number of columns | 3,083 |
| nonzeros | 11,767 |
| structural full rank? | yes |
| structural rank | 3,083 |
| # of blocks from dmperm | 1,872 |
| # strongly connected comp. | 2 |
| entries not in dmperm blocks | 3,895 |
| explicit zero entries | 9,449 |
| nonzero pattern symmetry | 2% |
| numeric value symmetry | 0% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | Bayer |
| editor | F. Grund |
| date | 1997 |
| kind | chemical process simulation problem |
| 2D/3D problem? | no |
| Additional fields | size and type |
| b | full 3083-by-1 |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 488,537 | 458,578 | 23,471 |
| Cholesky flop count | 2.8e+08 | 2.0e+08 | 9.9e+05 |
| nnz(L+U), no partial pivoting | 973,991 | 914,073 | 47,754 |
| nnz(V) for QR, upper bound nnz(L) for LU | 21,459 | 30,641 | 13,798 |
| nnz(R) for QR, upper bound nnz(U) for LU | 48,212 | 68,395 | 34,451 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 9449 explicit zero entries.
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.