Matrix properties
number of rows	41,731
number of columns	41,731
nonzeros	559,341
structural full rank?	yes
structural rank	41,731
# of blocks from dmperm	2
# strongly connected comp.	2
explicit zero entries	2
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	IBM
editor	O. Schenk
date	2003
kind	optimization problem sequence
2D/3D problem?	no

Additional fields	size and type
b	full 41731-by-1

Notes:

next: GHS_indef/c-62ghs first: Schenk_IBMNA/c-62                   
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	9,819,876
Cholesky flop count	1.7e+10
nnz(L+U), no partial pivoting, with AMD	19,598,021
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	125,386,645
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	173,367,965

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 2 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.