Matrix properties
number of rows	106,437
number of columns	106,437
nonzeros	2,707,179
structural full rank?	yes
structural rank	106,437
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	no
positive definite?	no

author	D. Hohlfield, T. Bechtold, H. Zappe
editor	E. Rudnyi
date	2006
kind	model reduction problem
2D/3D problem?	yes

Additional fields	size and type
E	sparse 106437-by-106437
B	sparse 106437-by-1
C	sparse 5-by-106437
cname	full 5-by-5

Notes:

Primary matrix in this model reduction problem is the Oberwolfach A matrix

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	29,046,310
Cholesky flop count	2.1e+10
nnz(L+U), no partial pivoting, with AMD	57,986,183
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	49,435,304
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	132,404,717

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.