Matrix properties
number of rows	1,258
number of columns	1,258
nonzeros	7,682
structural full rank?	yes
structural rank	1,258
# of blocks from dmperm	670
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	2%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	K. Pearson
editor	I. Duff, R. Grimes, J. Lewis
date	1984
kind	economic problem
2D/3D problem?	no

Additional fields	size and type
b	sparse 1258-by-55

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	73,433
Cholesky flop count	1.4e+07
nnz(L+U), no partial pivoting, with AMD	145,608
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	20,045
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	50,432

SVD-based statistics:
norm(A)	2.04511e+07
min(svd(A))	9.82129e-07
cond(A)	2.08232e+13
rank(A)	1,257
sprank(A)-rank(A)	1
null space dimension	1
full numerical rank?	no
singular value gap	15312.4

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.