| Matrix properties | |
| number of rows | 55,476 |
| number of columns | 55,476 |
| nonzeros | 759,952 |
| structural full rank? | yes |
| structural rank | 55,476 |
| # 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 | G. Kumfert, A. Pothen |
| editor | N. Gould, Y. Hu, J. Scott |
| date | 2004 |
| kind | duplicate computational fluid dynamics problem |
| 2D/3D problem? | yes |
Notes:
GHS_psdef/copter2 is the nonzero pattern of GHS_indef/copter2.
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 13,936,659 | 9,608,509 |
| Cholesky flop count | 1.2e+10 | 5.6e+09 |
| nnz(L+U), no partial pivoting | 27,817,842 | 19,161,542 |
| nnz(V) for QR, upper bound nnz(L) for LU | 32,503,916 | 23,582,518 |
| nnz(R) for QR, upper bound nnz(U) for LU | 64,894,256 | 47,014,136 |
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.