Matrix properties
number of rows	74,104
number of columns	74,104
nonzeros	365,580
structural full rank?	yes
structural rank	74,104
# of blocks from dmperm	114
# strongly connected comp.	1
explicit zero entries	0
nonzero pattern symmetry	0%
numeric value symmetry	0%
type	complex
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	J. Rost
editor	T. Davis
date	2007
kind	semiconductor device problem
2D/3D problem?	yes

Additional fields	size and type
b	sparse 74104-by-9

Notes:

Numerical Methods Laboratory, Politehnica Univ., Bucharest, Romania.   
Johann Rost, et al.  RF semiconductors and electronic device simulation
in the frequency domain.  UMFPACK (x=A\b in MATLAB) experiences high   
fill-in for this matrix.  KLU is worse.                                

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	774,731,752
Cholesky flop count	2.0e+13
nnz(L+U), no partial pivoting, with AMD	1,549,389,400
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	55,696,430
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	98,106,749

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.