Matrix: Schenk_IBMNA/c-big
Description: IBM TJ Watson, non-linear optimization
(undirected graph drawing) |
Matrix properties | |
number of rows | 345,241 |
number of columns | 345,241 |
nonzeros | 2,340,859 |
structural full rank? | yes |
structural rank | 345,241 |
# of blocks from dmperm | 77 |
# strongly connected comp. | 77 |
explicit zero entries | 152 |
nonzero pattern symmetry | symmetric |
numeric value symmetry | symmetric |
type | real |
structure | symmetric |
Cholesky candidate? | no |
positive definite? | no |
author | IBM |
editor | O. Schenk |
date | 2006 |
kind | optimization problem |
2D/3D problem? | no |
Additional fields | size and type |
b | full 345241-by-1 |
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 72,457,238 |
Cholesky flop count | 3.8e+11 |
nnz(L+U), no partial pivoting, with AMD | 144,569,235 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 5,764,764,512 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 7,781,773,988 |
Note that all matrix statistics (except nonzero pattern symmetry) exclude the 152 explicit zero entries.
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.