Matrix properties
number of rows	130
number of columns	130
nonzeros	1,037
structural full rank?	yes
structural rank	130
# of blocks from dmperm	55
# strongly connected comp.	55
entries not in dmperm blocks	296
explicit zero entries	245
nonzero pattern symmetry	76%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	A. Curtis
editor	A. Curtis, I. Duff, J. Reid
date	1974
kind	materials problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	841	840	520
Cholesky flop count	6.1e+03	6.1e+03	3.6e+03
nnz(L+U), no partial pivoting	1,552	1,550	1,206
nnz(V) for QR, upper bound nnz(L) for LU	982	701	1,042
nnz(R) for QR, upper bound nnz(U) for LU	2,935	3,179	2,261

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 245 explicit zero entries.

Maintained by Tim Davis, last updated 30-Sep-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.