| Matrix properties | |
| number of rows | 37,164 |
| number of columns | 37,164 |
| nonzeros | 2,205,144 |
| structural full rank? | yes |
| structural rank | 37,164 |
| # 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 | binary |
| structure | symmetric |
| Cholesky candidate? | yes |
| positive definite? | no |
| author | P. Chen |
| editor | T. Davis |
| date | 2002 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 15,324,774 | 8,890,458 |
| Cholesky flop count | 1.8e+10 | 4.8e+09 |
| nnz(L+U), no partial pivoting | 30,612,384 | 17,743,752 |
| nnz(V) for QR, upper bound nnz(L) for LU | 39,505,908 | 15,034,920 |
| nnz(R) for QR, upper bound nnz(U) for LU | 76,729,326 | 29,029,902 |
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.