Matrix properties
number of rows	52,329
number of columns	52,329
nonzeros	2,600,295
structural full rank?	yes
structural rank	52,329
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	98,168
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	R. Grimes
editor	T. Davis
date	1995
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	10,729,657
Cholesky flop count	7.1e+09
nnz(L+U), no partial pivoting, with AMD	21,406,985
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	26,993,567
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	52,637,780

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 98168 explicit zero entries.

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.