Matrix properties
number of rows	51,035
number of columns	51,035
nonzeros	707,985
structural full rank?	yes
structural rank	51,035
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	9,856
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 51035-by-1

Notes:

next: Schenk_IBMNA/c-64b first: Schenk_IBMNA/c-64

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	714,790
Cholesky flop count	5.1e+07
nnz(L+U), no partial pivoting, with AMD	1,378,545
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	164,995,256
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	214,333,915

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 9856 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.