| Matrix properties | |
| number of rows | 3,079 |
| number of columns | 3,079 |
| nonzeros | 53,099 |
| structural full rank? | yes |
| structural rank | 3,079 |
| # of blocks from dmperm | 3 |
| # strongly connected comp. | 3 |
| entries not in dmperm blocks | 240 |
| explicit zero entries | 744 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | 100% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | A. Baggag, Y. Saad |
| editor | A. Baggag, Y. Saad |
| date | 1994 |
| kind | computational fluid dynamics problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 63,978 | 75,620 | 139,021 |
| Cholesky flop count | 1.8e+06 | 2.6e+06 | 8.4e+06 |
| nnz(L+U), no partial pivoting | 124,877 | 148,161 | 275,203 |
| nnz(V) for QR, upper bound nnz(L) for LU | 127,553 | 150,096 | 126,001 |
| nnz(R) for QR, upper bound nnz(U) for LU | 358,873 | 392,502 | 308,438 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 744 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.