Matrix: ANSYS/Delor64K
Description: underdetermined system from ANSYS
(bipartite graph drawing) |
Matrix properties | |
number of rows | 64,719 |
number of columns | 1,785,345 |
nonzeros | 652,140 |
structural full rank? | yes |
structural rank | 64,719 |
# of blocks from dmperm | 1 |
# strongly connected comp. | 1,623,009 |
explicit zero entries | 0 |
nonzero pattern symmetry | 0% |
numeric value symmetry | 0% |
type | real |
structure | rectangular |
Cholesky candidate? | no |
positive definite? | no |
author | E. Delor |
editor | T. Davis |
date | 2011 |
kind | least squares problem |
2D/3D problem? | no |
Notes:
Goal is to find a permutation or factorization that places A in upper trapezoidal form, [R1 R2] where R1 is well-conditioned, square, and upper triangular, and where R1\R2 is as sparse as possible.
Ordering statistics: | result |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 17,136,354 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 2,550,393 |
For a description of the statistics displayed above, click here.
Maintained by Tim Davis, last updated 04-Jun-2015.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.