Matrix: GHS_indef/sparsine
Description: Gould, Hu, & Scott: structurual optimization (CUTEr)
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| (undirected graph drawing) |
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| Matrix properties | |
| number of rows | 50,000 |
| number of columns | 50,000 |
| nonzeros | 1,548,988 |
| structural full rank? | yes |
| structural rank | 50,000 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | symmetric |
| numeric value symmetry | symmetric |
| type | real |
| structure | symmetric |
| Cholesky candidate? | no |
| positive definite? | no |
| author | N. Gould |
| editor | N. Gould |
| date | 1995 |
| kind | structural problem |
| 2D/3D problem? | yes |
| Ordering statistics: | result |
| nnz(chol(P*(A+A'+s*I)*P')) with AMD | 552,420,000 |
| Cholesky flop count | 1.1e+13 |
| nnz(L+U), no partial pivoting, with AMD | 1,104,790,000 |
| nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 537,136,477 |
| nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 798,490,345 |
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.