Matrix properties
number of rows	37,833
number of columns	37,833
nonzeros	403,373
structural full rank?	yes
structural rank	37,833
# of blocks from dmperm	49
# strongly connected comp.	49
explicit zero entries	1,824
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 37833-by-1

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	342,529
Cholesky flop count	1.1e+07
nnz(L+U), no partial pivoting, with AMD	647,225
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	109,761,396
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	154,617,046

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1824 explicit zero entries.

SVD-based statistics:
norm(A)	72701
min(svd(A))	0.000409799
cond(A)	1.77406e+08
rank(A)	37,833
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 (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.