Matrix properties
number of rows	220,542
number of columns	220,542
nonzeros	9,895,422
structural full rank?	yes
structural rank	220,542
# of blocks from dmperm	9,908
# strongly connected comp.	9,908
explicit zero entries	873,014
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	24,256,888
Cholesky flop count	7.6e+09
nnz(L+U), no partial pivoting, with AMD	48,293,234
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	96,966,277
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	216,940,098

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 873014 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.