Matrix: QY/case9
Description: Transient stabilty constrained interior pt. optimal power flow, J. Quanyuan
(undirected graph drawing) |
Matrix properties | |
number of rows | 14,454 |
number of columns | 14,454 |
nonzeros | 147,972 |
structural full rank? | yes |
structural rank | 14,454 |
# of blocks from dmperm | 2 |
# strongly connected comp. | 2 |
explicit zero entries | 0 |
nonzero pattern symmetry | symmetric |
numeric value symmetry | symmetric |
type | real |
structure | symmetric |
Cholesky candidate? | no |
positive definite? | no |
author | J. Quanyuan |
editor | T. Davis |
date | 2008 |
kind | power network problem sequence |
2D/3D problem? | no |
Additional fields | size and type |
b | sparse 14454-by-1 |
A | cell 12-by-1 |
b1 | cell 12-by-1 |
b2 | cell 12-by-1 |
Notes:
Transient stabilty constrained interior pt. optimal power flow, J. Quanyuan Two problem sets from Dr. Jiang Quanyuan from Zhejiang University, Hangzhou, China, March, 2008, used in an electrical power system. Each matrix A is solved sequentially with two right-hand-sides, b1 and b2, one at a time. In the UF collection, the sequence of all first and second right-hand-sides is in Problem.aux.b2 and Problem.aux.b1. These matrices are symmetric indefinite (x=A\b uses MA57) Note that the last matrices in the sequence are ill-conditioned. Transient Stability Constrained Interior Point Optimal Power Flow Program Version 1.0 -- Developed by Dr. Jiang Quanyuan, March 2008 case9.m - TSOPF converges after 12 iterations object = 3.945939E+03 max_equ = 3.287326E-11 low_inequ = None up_inequ = None
Ordering statistics: | result |
nnz(chol(P*(A+A'+s*I)*P')) with AMD | 178,786 |
Cholesky flop count | 2.6e+06 |
nnz(L+U), no partial pivoting, with AMD | 343,118 |
nnz(V) for QR, upper bound nnz(L) for LU, with COLAMD | 591,437 |
nnz(R) for QR, upper bound nnz(U) for LU, with COLAMD | 42,799,020 |
SVD-based statistics: | |
norm(A) | 5306.19 |
min(svd(A)) | 6.37429e-09 |
cond(A) | 8.32437e+11 |
rank(A) | 14,444 |
sprank(A)-rank(A) | 10 |
null space dimension | 10 |
full numerical rank? | no |
singular value gap | 1.22581 |
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.