Averous/epb2 sparse matrix

Matrix: Averous/epb2

Description: Plate-fin heat exchanger w/flow redistrib(DAE) David.Averous@ensigct.fr

download as a MATLAB mat-file, file size: 1 MB. Use UFget(289) or UFget('Averous/epb2') in MATLAB.

Averous/epb2

Matrix properties

number of rows 25,228

number of columns 25,228

nonzeros 175,027

structural full rank? yes

structural rank 25,228

# of blocks from dmperm 1

# strongly connected comp. 1

entries not in dmperm blocks 0

explicit zero entries 0

nonzero pattern symmetry 67%

numeric value symmetry 0%

type real

structure unsymmetric

Cholesky candidate? no

positive definite? no

author D. Averous
editor T. Davis
date 1998
kind thermal problem
2D/3D problem? yes

Ordering statistics: AMD METIS

nnz(chol(P*(A+A'+s*I)*P')) 1,156,565 1,242,326

Cholesky flop count 2.2e+08 2.2e+08

nnz(L+U), no partial pivoting 2,287,902 2,459,424

nnz(V) for QR, upper bound nnz(L) for LU 1,411,488 1,440,828

nnz(R) for QR, upper bound nnz(U) for LU 2,800,131 2,850,203

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	25,228
number of columns	25,228
nonzeros	175,027
structural full rank?	yes
structural rank	25,228
# of blocks from dmperm	1
# strongly connected comp.	1
entries not in dmperm blocks	0
explicit zero entries	0
nonzero pattern symmetry	67%
numeric value symmetry	0%
type	real
structure	unsymmetric
Cholesky candidate?	no
positive definite?	no

author	D. Averous
editor	T. Davis
date	1998
kind	thermal problem
2D/3D problem?	yes

Ordering statistics:	AMD	METIS
nnz(chol(P(A+A'+sI)*P'))	1,156,565	1,242,326
Cholesky flop count	2.2e+08	2.2e+08
nnz(L+U), no partial pivoting	2,287,902	2,459,424
nnz(V) for QR, upper bound nnz(L) for LU	1,411,488	1,440,828
nnz(R) for QR, upper bound nnz(U) for LU	2,800,131	2,850,203