Norris/torso1 sparse matrix

Matrix: Norris/torso1

Description: S.Norris, Univ Auckland. finite diff/boundary elem, 2D model of torso

download as a MATLAB mat-file, file size: 66 MB. Use UFget(896) or UFget('Norris/torso1') in MATLAB.

Norris/torso1

Matrix properties

number of rows 116,158

number of columns 116,158

nonzeros 8,516,500

structural full rank? yes

structural rank 116,158

# of blocks from dmperm 1

# strongly connected comp. 1

entries not in dmperm blocks 0

explicit zero entries 0

nonzero pattern symmetry 42%

numeric value symmetry 0%

type real

structure unsymmetric

Cholesky candidate? no

positive definite? no

author S. Norris
editor T. Davis
date 2003
kind 2D/3D problem
2D/3D problem? yes

Ordering statistics: AMD METIS

nnz(chol(P*(A+A'+s*I)*P')) 15,162,244 18,007,730

Cholesky flop count 1.4e+10 1.8e+10

nnz(L+U), no partial pivoting 30,208,330 35,899,302

nnz(V) for QR, upper bound nnz(L) for LU 27,787,764 26,667,950

nnz(R) for QR, upper bound nnz(U) for LU 50,282,771 47,328,978

Maintained by Tim Davis, last updated 04-May-2008.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.

Matrix properties
number of rows	116,158
number of columns	116,158
nonzeros	8,516,500
structural full rank?	yes
structural rank	116,158
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	42%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	S. Norris
editor	T. Davis
date	2003
kind	2D/3D problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P(A+A'+sI)*P'))	15,162,244	18,007,730
Cholesky flop count	1.4e+10	1.8e+10
nnz(L+U), no partial pivoting	30,208,330	35,899,302
nnz(V) for QR, upper bound nnz(L) for LU	27,787,764	26,667,950
nnz(R) for QR, upper bound nnz(U) for LU	50,282,771	47,328,978