| Matrix properties | |
| number of rows | 3,008 |
| number of columns | 3,008 |
| nonzeros | 20,698 |
| structural full rank? | yes |
| structural rank | 3,008 |
| # of blocks from dmperm | 1,273 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 2,063 |
| explicit zero entries | 6,878 |
| nonzero pattern symmetry | 1% |
| 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 |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 589,860 | 490,752 | 73,674 |
| Cholesky flop count | 3.5e+08 | 1.9e+08 | 6.8e+06 |
| nnz(L+U), no partial pivoting | 1,176,712 | 978,496 | 146,403 |
| nnz(V) for QR, upper bound nnz(L) for LU | 109,791 | 105,103 | 67,253 |
| nnz(R) for QR, upper bound nnz(U) for LU | 193,751 | 210,471 | 136,407 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 6878 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.