| Matrix properties | |
| number of rows | 70,304 |
| number of columns | 70,304 |
| nonzeros | 1,494,006 |
| structural full rank? | yes |
| structural rank | 70,304 |
| # of blocks from dmperm | 15,970 |
| # strongly connected comp. | 121 |
| entries not in dmperm blocks | 758,736 |
| explicit zero entries | 34,086 |
| nonzero pattern symmetry | 0% |
| 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 70304-by-1 |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 148,516,256 | 92,294,731 | 1,908,874 |
| Cholesky flop count | 8.0e+11 | 2.6e+11 | 1.3e+08 |
| nnz(L+U), no partial pivoting | 296,962,208 | 184,519,158 | 4,506,180 |
| nnz(V) for QR, upper bound nnz(L) for LU | 3,093,273 | 3,670,711 | 1,300,137 |
| nnz(R) for QR, upper bound nnz(U) for LU | 6,921,017 | 8,344,782 | 3,544,915 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 34086 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.