Matrix properties
number of rows	31,793
number of columns	31,793
nonzeros	385,987
structural full rank?	yes
structural rank	31,793
# of blocks from dmperm	20
# strongly connected comp.	20
explicit zero entries	5,706
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 31793-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	662,692
Cholesky flop count	6.7e+07
nnz(L+U), no partial pivoting, with AMD	1,293,591
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	12,893,737
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	20,126,280

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 5706 explicit zero entries.

SVD-based statistics:
norm(A)	1.82553e+08
min(svd(A))	9.99998e-09
cond(A)	1.82554e+16
rank(A)	31,404
sprank(A)-rank(A)	389
null space dimension	389
full numerical rank?	no
singular value gap	1.11111

singular values (MAT file):	click here
SVD method used:	s = svd (full (A))
status:	ok

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.