Matrix properties
number of rows	55,476
number of columns	55,476
nonzeros	759,952
structural full rank?	yes
structural rank	55,476
# 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	G. Kumfert, A. Pothen
editor	N. Gould, Y. Hu, J. Scott
date	2004
kind	duplicate computational fluid dynamics problem
2D/3D problem?	yes

Notes:

GHS_psdef/copter2 is the nonzero pattern of GHS_indef/copter2.

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	13,936,659
Cholesky flop count	1.2e+10
nnz(L+U), no partial pivoting, with AMD	27,817,842
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	32,503,916
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	64,894,256

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.