Matrix properties
number of rows	31,802
number of columns	31,802
nonzeros	2,164,210
structural full rank?	yes
structural rank	31,802
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	A. Gupta
editor	T. Davis
date	1996
kind	optimization problem
2D/3D problem?	no

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	2,298,971
Cholesky flop count	2.9e+08
nnz(L+U), no partial pivoting, with AMD	4,566,140
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	278,727,707
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	504,396,359

SVD-based statistics:
norm(A)	420.319
min(svd(A))	0
cond(A)	Inf
rank(A)	30,782
sprank(A)-rank(A)	1,020
null space dimension	1,020
full numerical rank?	no
singular value gap	3.14865e+06

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.