Matrix properties
number of rows	30,003
number of columns	30,003
nonzeros	109,999
structural full rank?	no
structural rank	30,002
# of blocks from dmperm	20,003
# strongly connected comp.	2
explicit zero entries	10,001
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	J. Blowey
editor	N. Gould
date	1992
kind	materials problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	99,999
Cholesky flop count	3.6e+05
nnz(L+U), no partial pivoting, with AMD	169,995
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	79,992
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	100,139,986

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 10001 explicit zero entries.

SVD-based statistics:
norm(A)	100.008
min(svd(A))	4.33152e-19
cond(A)	2.30883e+20
rank(A)	20,028
sprank(A)-rank(A)	9,974
null space dimension	9,975
full numerical rank?	no
singular value gap	1.16396

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.