Matrix: VanVelzen/Zd_Jac2_db
Description: Chemical process simulation, Nils van Velzen (diagonal blocks only)
(bipartite graph drawing) | (graph drawing of A+A') |
Matrix properties | |
number of rows | 22,835 |
number of columns | 22,835 |
nonzeros | 676,439 |
structural full rank? | yes |
structural rank | 22,835 |
# of blocks from dmperm | 9,833 |
# strongly connected comp. | 9,833 |
explicit zero entries | 0 |
nonzero pattern symmetry | 30% |
numeric value symmetry | 0% |
type | real |
structure | unsymmetric |
Cholesky candidate? | no |
positive definite? | no |
author | N. van Velzen |
editor | T. Davis |
date | 2006 |
kind | chemical process simulation problem |
2D/3D problem? | no |
Additional fields | size and type |
b | full 22835-by-1 |
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 3,285,210 |
Cholesky flop count | 2.0e+09 |
nnz(L+U), no partial pivoting, with AMD | 6,547,585 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 1,629,609 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 3,910,842 |
SVD-based statistics: | |
norm(A) | 1.37636e+09 |
min(svd(A)) | 2.31934e-10 |
cond(A) | 5.93429e+18 |
rank(A) | 22,360 |
sprank(A)-rank(A) | 475 |
null space dimension | 475 |
full numerical rank? | no |
singular value gap | 1.03432 |
singular values (MAT file): | click here |
SVD method used: | s = svd (full (R)) ; where [~,R,E] = spqr (A) with droptol of zero |
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.