Matrix properties
number of rows	90,449
number of columns	90,449
nonzeros	3,753,461
structural full rank?	yes
structural rank	90,449
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	binary
structure	symmetric
Cholesky candidate?	yes
positive definite?	no

author	R. Kouhia
editor	T. Davis
date	2008
kind	structural problem
2D/3D problem?	yes

Additional fields	size and type
coord	full 90449-by-3

Notes:

Matrix problems from Reijo Kouhia, Structural Mechanics, Helsinki  
University of Technology.   http://users.tkk.fi/~kouhia/sparse.html

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	18,244,931
Cholesky flop count	9.2e+09
nnz(L+U), no partial pivoting, with AMD	36,399,413
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	36,697,046
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	72,213,584

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.