| Matrix properties | |
| number of rows | 13,935 |
| number of columns | 13,935 |
| nonzeros | 63,307 |
| structural full rank? | yes |
| structural rank | 13,935 |
| # of blocks from dmperm | 2,226 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 6,828 |
| explicit zero entries | 372 |
| nonzero pattern symmetry | 0% |
| numeric value symmetry | 0% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | Bayer |
| editor | F. Grund |
| date | 1997 |
| kind | chemical process simulation problem |
| 2D/3D problem? | no |
| Additional fields | size and type |
| b | full 13935-by-1 |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 12,891,970 | 7,334,054 | 201,743 |
| Cholesky flop count | 4.0e+10 | 9.7e+09 | 7.9e+06 |
| nnz(L+U), no partial pivoting | 25,770,005 | 14,654,173 | 396,379 |
| nnz(V) for QR, upper bound nnz(L) for LU | 161,526 | 199,262 | 155,054 |
| nnz(R) for QR, upper bound nnz(U) for LU | 323,903 | 395,915 | 321,665 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 372 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.