Matrix properties
number of rows	2,048
number of columns	2,048
nonzeros	12,032
structural full rank?	yes
structural rank	2,048
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	79%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	K. Meerbergen
editor	Z. Bai, D. Day, J. Demmel, J. Dongarra
date	1994
kind	computational fluid dynamics problem
2D/3D problem?	yes

Notes:

This matrix (Bai/rdb2048) is the same as the original NEP RDB2048L
matrix (as of Nov 2006).  Either the name changed since 1996 and  
the L was added in the NEP collection, or the L was dropped when  
the matrix as added to the UF Sparse Matrix Collection in 1996.   
The name cannot be corrected here without disrupting the UF Sparse
Matrix Collection.  To make matters worse, there is now a matrix  
in the NEP collection with the name RDB2048, as of Nov 2006.  The 
NEP RDB2048 matrix was added to this collection in Nov 2006, as   
Bai/rdb2038_noL matrix.                                           

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	42,141
Cholesky flop count	1.8e+06
nnz(L+U), no partial pivoting, with AMD	82,234
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	76,629
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	140,021

SVD-based statistics:
norm(A)	73.7649
min(svd(A))	0.100922
cond(A)	730.909
rank(A)	2,048
sprank(A)-rank(A)	0
null space dimension	0
full numerical rank?	yes

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.