Matrix: Qaplib/lp_nug20
Description: Netlib LP problem nug20: minimize c'*x, where Ax=b, lo<=x<=hi
| Matrix properties | |
| number of rows | 15,240 |
| number of columns | 72,600 |
| nonzeros | 304,800 |
| structural full rank? | yes |
| structural rank | 15,240 |
| # of blocks from dmperm | 1 |
| # strongly connected comp. | 1 |
| entries not in dmperm blocks | 0 |
| explicit zero entries | 0 |
| nonzero pattern symmetry | 0% |
| numeric value symmetry | 0% |
| type | integer |
| structure | rectangular |
| Cholesky candidate? | no |
| positive definite? | no |
| author | M. Resende |
| editor | M. Resende |
| date | 1995 |
| kind | linear programming problem |
| 2D/3D problem? | no |
| Additional fields | size and type |
| b | full 15240-by-1 |
| c | full 72600-by-1 |
| lo | full 72600-by-1 |
| hi | full 72600-by-1 |
| z0 | full 1-by-1 |
| Ordering statistics: | AMD | METIS |
| nnz(V) for QR, upper bound nnz(L) for LU | 666,619,904 | 479,407,510 |
| nnz(R) for QR, upper bound nnz(U) for LU | 63,208,943 | 49,116,435 |
Maintained by Tim Davis, last updated 05-Nov-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.