Matrix: Boeing/bcsstm38
Description: MASS MATRIX, AIRPLANE ENGINE COMPONENT
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| Matrix properties | |
| number of rows | 8,032 |
| number of columns | 8,032 |
| nonzeros | 10,485 |
| structural full rank? | no |
| structural rank | 5,199 |
| # of blocks from dmperm | 3,825 |
| # strongly connected comp. | 6,656 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | symmetric |
| type | real |
| structure | symmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | R. Grimes |
| editor | T. Davis |
| date | 1995 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | result |
| nnz(chol(P*(A+A'+s*I)*P')) with AMD | 10,771 |
| Cholesky flop count | 2.3e+04 |
| nnz(L+U), no partial pivoting, with AMD | 13,510 |
| nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 10,963 |
| nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 11,658 |
| SVD-based statistics: | |
| norm(A) | 541.104 |
| min(svd(A)) | 0 |
| cond(A) | Inf |
| rank(A) | 5,112 |
| sprank(A)-rank(A) | 87 |
| null space dimension | 2,920 |
| full numerical rank? | no |
| singular value gap | 95331.3 |
| 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.