Matrix properties
number of rows	3,251
number of columns	3,251
nonzeros	65,875
structural full rank?	yes
structural rank	3,251
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	900
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	A. Baggag, Y. Saad
editor	A. Baggag, Y. Saad
date	1994
kind	computational fluid dynamics problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	108,468
Cholesky flop count	6.1e+06
nnz(L+U), no partial pivoting, with AMD	213,685
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	241,684
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	723,046

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 900 explicit zero entries.

SVD-based statistics:
norm(A)	1.26662e+07
min(svd(A))	8.38202e-10
cond(A)	1.51112e+16
rank(A)	2,925
sprank(A)-rank(A)	326
null space dimension	326
full numerical rank?	no
singular value gap	1.01973

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.