Matrix: Gaertner/nopoly
Description: Structuresymmetric Matrix nopoly K. Gaertner ETH Zurich Jan 1998.
| Matrix properties | |
| number of rows | 10,774 |
| number of columns | 10,774 |
| nonzeros | 70,842 |
| structural full rank? | yes |
| structural rank | 10,774 |
| # 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 | integer |
| structure | symmetric |
| Cholesky candidate? | yes |
| positive definite? | no |
| author | K. Gaertner |
| editor | F. Grund |
| date | 2001 |
| kind | undirected weighted graph |
| 2D/3D problem? | no |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 163,985 | 167,565 |
| Cholesky flop count | 4.6e+06 | 4.4e+06 |
| nnz(L+U), no partial pivoting | 317,196 | 324,356 |
| nnz(V) for QR, upper bound nnz(L) for LU | 222,086 | 248,735 |
| nnz(R) for QR, upper bound nnz(U) for LU | 423,762 | 468,921 |
Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.