Matrix properties
number of rows	22,695
number of columns	22,695
nonzeros	1,215,181
structural full rank?	yes
structural rank	22,695
# of blocks from dmperm	4
# strongly connected comp.	4
entries not in dmperm blocks	135,128
explicit zero entries	135,128
nonzero pattern symmetry	symmetric
numeric value symmetry	87%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

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

Ordering statistics:	AMD	METIS	DMPERM+
nnz(chol(P*(A+A'+s*I)*P'))	30,408,095	13,698,973	6,273,717
Cholesky flop count	7.9e+10	1.6e+10	3.2e+09
nnz(L+U), no partial pivoting	60,793,495	27,375,251	12,659,867
nnz(V) for QR, upper bound nnz(L) for LU	33,668,257	20,853,139	9,238,562
nnz(R) for QR, upper bound nnz(U) for LU	56,815,640	39,051,932	17,416,453

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 135128 explicit zero entries.

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.