Matrix: HB/cegb3306
Description: FINITE ELEMENT FRAMEWORK PROBLEM, ESSENTIALLY IN TWO DIMENSIONS
|
| (undirected graph drawing) |
 |
 |
 |
| Matrix properties | |
| number of rows | 3,306 |
| number of columns | 3,306 |
| nonzeros | 74,916 |
| structural full rank? | no |
| structural rank | 3,222 |
| # of blocks from dmperm | 3 |
| # strongly connected comp. | 85 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | symmetric |
| type | binary |
| structure | symmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | A. Donovan |
| editor | I. Duff, R. Grimes, J. Lewis |
| date | 1980 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | result |
| nnz(chol(P*(A+A'+s*I)*P')) with AMD | 67,989 |
| Cholesky flop count | 2.0e+06 |
| nnz(L+U), no partial pivoting, with AMD | 132,672 |
| nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 247,881 |
| nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 489,657 |
| SVD-based statistics: | |
| norm(A) | 36.0403 |
| min(svd(A)) | 0 |
| cond(A) | Inf |
| rank(A) | 537 |
| sprank(A)-rank(A) | 2,685 |
| null space dimension | 2,769 |
| full numerical rank? | no |
| singular value gap | 3.54335e+11 |
| singular values (MAT file): | click here |
| SVD method used: | s = svd (full (A)) ; |
| status: | ok |
For a description of the statistics displayed above, click here.
Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.