Matrix: Pothen/sphere3
Description: sphere3, with coordinates. From NASA, collected by Alex Pothen
| Matrix properties | |
| number of rows | 258 |
| number of columns | 258 |
| nonzeros | 1,794 |
| structural full rank? | yes |
| structural rank | 258 |
| # 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 | NASA |
| editor | G. Kumfert, A. Pothen |
| date | 2003 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Additional fields | size and type |
| coord | full 258-by-3 |
| Ordering statistics: | AMD | METIS |
| nnz(chol(P*(A+A'+s*I)*P')) | 4,467 | 4,178 |
| Cholesky flop count | 1.1e+05 | 9.0e+04 |
| nnz(L+U), no partial pivoting | 8,676 | 8,098 |
| nnz(V) for QR, upper bound nnz(L) for LU | 5,191 | 5,916 |
| nnz(R) for QR, upper bound nnz(U) for LU | 9,301 | 10,262 |
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.