Matrix properties
number of rows	49,989
number of columns	49,989
nonzeros	444,853
structural full rank?	yes
structural rank	49,989
# of blocks from dmperm	6
# strongly connected comp.	6
explicit zero entries	54,154
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 49989-by-1

Notes:

next: Schenk_IBMNA/c-66b first: Schenk_IBMNA/c-66

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	1,009,419
Cholesky flop count	2.7e+08
nnz(L+U), no partial pivoting, with AMD	1,968,849
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	79,558,463
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	174,206,755

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 54154 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.