Matrix properties
number of rows	22,695
number of columns	22,695
nonzeros	1,350,309
structural full rank?	yes
structural rank	22,695
# of blocks from dmperm	2
# strongly connected comp.	2
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	B. Li
editor	T. Davis
date	1999
kind	duplicate electromagnetics problem
2D/3D problem?	yes

Notes:

nonzero pattern of Li/li

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	30,408,095	13,698,973	13,142,870
Cholesky flop count	7.9e+10	1.6e+10	1.4e+10
nnz(L+U), no partial pivoting	60,793,495	27,375,251	26,263,045
nnz(V) for QR, upper bound nnz(L) for LU	28,808,169	20,942,615	20,522,988
nnz(R) for QR, upper bound nnz(U) for LU	49,884,385	39,132,396	38,156,141

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.