Matrix properties
number of rows	127,224
number of columns	127,224
nonzeros	5,516,602
structural full rank?	yes
structural rank	127,224
# of blocks from dmperm	1
# strongly connected comp.	1
explicit zero entries	1,198,550
nonzero pattern symmetry	symmetric
numeric value symmetry	symmetric
type	real
structure	symmetric
Cholesky candidate?	yes
positive definite?	yes

author	B. van Rietbergen, E. Rudnyi, J. Korvink
editor	E. Rudnyi
date	2006
kind	model reduction problem
2D/3D problem?	yes

Additional fields	size and type
M	sparse 127224-by-127224
B	sparse 127224-by-1
C	sparse 3-by-127224
cname	full 3-by-8

Notes:

Primary matrix in this model reduction problem is the Oberwolfach K matrix

Ordering statistics:	result
nnz(chol(P*(A+A'+s*I)*P')) with AMD	59,350,868
Cholesky flop count	1.3e+11
nnz(L+U), no partial pivoting, with AMD	118,574,512
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD	129,340,795
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD	255,285,585

Note that all matrix statistics (except nonzero pattern symmetry) exclude the 1198550 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.