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
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:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	30,408,095
Cholesky flop count	7.9e+10
nnz(L+U), no partial pivoting, with AMD	60,793,495
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	33,668,257
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	56,815,640

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

SVD-based statistics:
norm(A)	4.35984e+08
min(svd(A))	3.57095e-06
cond(A)	1.22092e+14
rank(A)	22,640
sprank(A)-rank(A)	55
null space dimension	55
full numerical rank?	no
singular value gap	1.02609

singular values (MAT file):	click here
SVD method used:	s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero
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.