Matrix properties
number of rows	2,999,349
number of columns	2,999,349
nonzeros	14,313,235
structural full rank?	yes
structural rank	2,999,349
# of blocks from dmperm	608,917
# strongly connected comp.	608,915
explicit zero entries	8,729,442
nonzero pattern symmetry	99%
numeric value symmetry	56%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	K. Gullapalli
editor	T. Davis
date	2015
kind	circuit simulation matrix
2D/3D problem?	no

Notes:

Circuit simulation matrix from Kiran Gullapalli, Freescale.
This is a DC matrix with lots of explicit zero entries.    
In subsequent iterations, many of the explicit zero entries
become nonzero.                                            

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	14,805,384
Cholesky flop count	2.2e+08
nnz(L+U), no partial pivoting, with AMD	26,611,419
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	511,580,472
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	1,063,360,882

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 8729442 explicit zero entries.

For a description of the statistics displayed above, click here.

Maintained by Tim Davis, last updated 04-Jun-2015.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.