| Matrix properties | |
| number of rows | 36,057 |
| number of columns | 36,057 |
| nonzeros | 222,596 |
| structural full rank? | yes |
| structural rank | 36,057 |
| # of blocks from dmperm | 3,843 |
| # strongly connected comp. | 203 |
| entries not in dmperm blocks | 4,858 |
| explicit zero entries | 5,032 |
| nonzero pattern symmetry | 11% |
| numeric value symmetry | 7% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | R. Melville, D. Long |
| editor | T. Davis |
| date | 2001 |
| kind | frequency-domain circuit simulation problem |
| 2D/3D problem? | no |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 4,018,036 | 3,601,690 | 823,633 |
| Cholesky flop count | 1.0e+09 | 8.0e+08 | 1.3e+08 |
| nnz(L+U), no partial pivoting | 8,000,015 | 7,167,323 | 1,616,067 |
| nnz(V) for QR, upper bound nnz(L) for LU | 488,470 | 775,051 | 642,745 |
| nnz(R) for QR, upper bound nnz(U) for LU | 1,065,910 | 1,632,286 | 1,230,354 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 5032 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.