Matrix: Wang/swang1
Description: Discret.vorticity eqn, square driven cavity, semiconductor device sim.
(undirected graph drawing) |
Matrix properties | |
number of rows | 3,169 |
number of columns | 3,169 |
nonzeros | 20,841 |
structural full rank? | yes |
structural rank | 3,169 |
# of blocks from dmperm | 1 |
# strongly connected comp. | 1 |
explicit zero entries | 0 |
nonzero pattern symmetry | symmetric |
numeric value symmetry | 0% |
type | real |
structure | unsymmetric |
Cholesky candidate? | no |
positive definite? | no |
author | S. Wang |
editor | T. Davis |
date | 1994 |
kind | semiconductor device problem sequence |
2D/3D problem? | yes |
Notes:
next: Wang/swang2 first: Wang/swang1
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 60,493 |
Cholesky flop count | 2.0e+06 |
nnz(L+U), no partial pivoting, with AMD | 117,817 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 87,927 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 163,509 |
SVD-based statistics: | |
norm(A) | 0.019719 |
min(svd(A)) | 0.00329174 |
cond(A) | 5.99045 |
rank(A) | 3,169 |
sprank(A)-rank(A) | 0 |
null space dimension | 0 |
full numerical rank? | yes |
singular values (MAT file): | click here |
SVD method used: | s = svd (full (A)) ; |
status: | ok |
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.