| Matrix properties | |
| number of rows | 7,337 |
| number of columns | 7,337 |
| nonzeros | 154,660 |
| structural full rank? | yes |
| structural rank | 7,337 |
| # of blocks from dmperm | 676 |
| # strongly connected comp. | 31 |
| entries not in dmperm blocks | 9,688 |
| explicit zero entries | 1,848 |
| nonzero pattern symmetry | 2% |
| numeric value symmetry | 0% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | J. Mallya |
| editor | T. Davis |
| date | 1994 |
| kind | chemical process simulation problem |
| 2D/3D problem? | no |
| Additional fields | size and type |
| b | full 7337-by-1 |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 5,655,624 | 4,424,344 | 360,290 |
| Cholesky flop count | 1.1e+10 | 5.3e+09 | 2.8e+07 |
| nnz(L+U), no partial pivoting | 11,303,911 | 8,841,351 | 722,931 |
| nnz(V) for QR, upper bound nnz(L) for LU | 260,245 | 350,902 | 230,346 |
| nnz(R) for QR, upper bound nnz(U) for LU | 618,397 | 761,405 | 508,798 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1848 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.