Matrix: Sandia/fpga_trans_02
Description: Sandia/fpga_trans_02 circuit simulation matrix. Sandia National Lab.
(undirected graph drawing) |
Matrix properties | |
number of rows | 1,220 |
number of columns | 1,220 |
nonzeros | 7,382 |
structural full rank? | yes |
structural rank | 1,220 |
# of blocks from dmperm | 133 |
# strongly connected comp. | 1 |
explicit zero entries | 0 |
nonzero pattern symmetry | symmetric |
numeric value symmetry | 21% |
type | real |
structure | unsymmetric |
Cholesky candidate? | no |
positive definite? | no |
author | R. Hoekstra |
editor | T. Davis |
date | 2003 |
kind | subsequent circuit simulation problem |
2D/3D problem? | no |
Additional fields | size and type |
b | full 1220-by-1 |
Notes:
next: - first: Sandia/fpga_trans_01
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 5,541 |
Cholesky flop count | 2.8e+04 |
nnz(L+U), no partial pivoting, with AMD | 9,862 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 14,484 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 39,947 |
SVD-based statistics: | |
norm(A) | 2.8877 |
min(svd(A)) | 0.000235743 |
cond(A) | 12249.4 |
rank(A) | 1,220 |
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.