Matrix properties
number of rows	21,132
number of columns	21,132
nonzeros	157,040
structural full rank?	yes
structural rank	21,132
# 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	2006
kind	optimization problem
2D/3D problem?	no

Additional fields	size and type
b	full 21132-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	307,106
Cholesky flop count	3.8e+07
nnz(L+U), no partial pivoting, with AMD	593,080
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	13,114,937
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	19,959,678

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

SVD-based statistics:
norm(A)	153152
min(svd(A))	0.000254199
cond(A)	6.02489e+08
rank(A)	21,132
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

singular values (MAT file):	click here
SVD method used:	s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.