| Matrix properties | |
| number of rows | 4,350 |
| number of columns | 4,350 |
| nonzeros | 237,798 |
| structural full rank? | yes |
| structural rank | 4,350 |
| # 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 | E. Rothberg |
| editor | T. Davis |
| date | 1997 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 2,361,326 | 1,329,313 |
| Cholesky flop count | 2.0e+09 | 5.4e+08 |
| nnz(L+U), no partial pivoting | 4,718,302 | 2,654,276 |
| nnz(V) for QR, upper bound nnz(L) for LU | 1,851,785 | 1,946,644 |
| nnz(R) for QR, upper bound nnz(U) for LU | 3,321,077 | 3,594,882 |
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.