Matrix properties
number of rows	73,752
number of columns	73,752
nonzeros	2,148,558
structural full rank?	yes
structural rank	73,752
# of blocks from dmperm	17,459
# strongly connected comp.	17,459
explicit zero entries	1,448,630
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	J. Weiher
editor	J. Koster
date	2004
kind	structural problem
2D/3D problem?	yes

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	5,854,658
Cholesky flop count	1.8e+09
nnz(L+U), no partial pivoting, with AMD	11,635,564
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	19,614,906
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	41,653,938

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1448630 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.