Matrix properties
number of rows	2,500
number of columns	2,500
nonzeros	12,349
structural full rank?	yes
structural rank	2,500
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	99%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	C. Yang
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1996
kind	materials problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	35,865
Cholesky flop count	1.0e+06
nnz(L+U), no partial pivoting, with AMD	69,230
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	61,659
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	112,569

SVD-based statistics:
norm(A)	9831.06
min(svd(A))	2.70724e-13
cond(A)	3.63139e+16
rank(A)	2,499
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	2.93106e+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.