| Matrix properties | |
| number of rows | 588 |
| number of columns | 588 |
| nonzeros | 24,270 |
| structural full rank? | yes |
| structural rank | 588 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | symmetric |
| type | real |
| structure | symmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | R. Grimes |
| editor | T. Davis |
| date | 1995 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 45,404 | 44,240 |
| Cholesky flop count | 4.5e+06 | 4.1e+06 |
| nnz(L+U), no partial pivoting | 90,220 | 87,892 |
| nnz(V) for QR, upper bound nnz(L) for LU | 40,616 | 52,458 |
| nnz(R) for QR, upper bound nnz(U) for LU | 71,894 | 89,894 |
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.