| Matrix properties | |
| number of rows | 4,960 |
| number of columns | 4,960 |
| nonzeros | 19,848 |
| structural full rank? | yes |
| structural rank | 4,960 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 4,036 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | 31% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | S. Hamm |
| editor | T. Davis |
| date | 1991 |
| kind | circuit simulation problem |
| 2D/3D problem? | no |
| Additional fields | size and type |
| b | full 4960-by-1 |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 14,377 | 14,619 |
| Cholesky flop count | 4.3e+04 | 4.5e+04 |
| nnz(L+U), no partial pivoting | 23,794 | 24,278 |
| nnz(V) for QR, upper bound nnz(L) for LU | 19,873 | 22,320 |
| nnz(R) for QR, upper bound nnz(U) for LU | 40,695 | 43,765 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 4036 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.