Matrix: Hohn/fd15
Description: M. Hohn, Univ Utah. Single-material crack problem, finite diff log grid
| Matrix properties | |
| number of rows | 11,532 |
| number of columns | 11,532 |
| nonzeros | 44,206 |
| structural full rank? | yes |
| structural rank | 11,532 |
| # of blocks from dmperm | 887 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 1,553 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 0% |
| numeric value symmetry | 0% |
| type | real |
| structure | unsymmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | M. Hohn |
| editor | T. Davis |
| date | 2003 |
| kind | materials problem |
| 2D/3D problem? | yes |
| Additional fields | size and type |
| b | full 11532-by-1 |
| Ordering statistics: | AMD | METIS | DMPERM+ |
| nnz(chol(P*(A+A'+s*I)*P')) | 4,048,671 | 6,473,316 | 394,752 |
| Cholesky flop count | 5.1e+09 | 9.6e+09 | 3.6e+07 |
| nnz(L+U), no partial pivoting | 8,085,810 | 12,935,100 | 779,525 |
| nnz(V) for QR, upper bound nnz(L) for LU | 453,719 | 421,618 | 409,249 |
| nnz(R) for QR, upper bound nnz(U) for LU | 885,744 | 830,534 | 787,033 |
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.