Matrix properties
number of rows	76,638
number of columns	76,638
nonzeros	859,520
structural full rank?	yes
structural rank	76,638
# of blocks from dmperm	18
# strongly connected comp.	18
explicit zero entries	34
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	IBM
editor	O. Schenk
date	2004
kind	optimization problem
2D/3D problem?	no

Additional fields	size and type
b	full 76638-by-1

Notes:

Revised Nov 2006; relative eps changes to A, right-hand-side added.
Note that this matrix should have been placed in the Schenk_IBMNA/ 
directory when it was first added in August 2004, but moving it now
would disrupt exising users of the collection.                     

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	19,945,308
Cholesky flop count	5.7e+10
nnz(L+U), no partial pivoting, with AMD	39,813,978
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	321,864,432
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	426,224,761

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 34 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.