LPnetlib/lpi_forest6
Netlib LP problem forest6: minimize c'*x, where Ax=b, lo<=x<=hi
| Name |
lpi_forest6 |
| Group |
LPnetlib |
| Matrix ID |
714 |
|
Num Rows
|
66 |
|
Num Cols
|
131 |
|
Nonzeros
|
246 |
|
Pattern Entries
|
246 |
|
Kind
|
Linear Programming Problem |
|
Symmetric
|
No |
|
Date
|
1993 |
|
Author
|
H. Greenberg |
|
Editor
|
J. Chinneck |
| Structural Rank |
66 |
| Structural Rank Full |
true |
|
Num Dmperm Blocks
|
1 |
|
Strongly Connect Components
|
1 |
|
Num Explicit Zeros
|
0 |
|
Pattern Symmetry
|
0% |
|
Numeric Symmetry
|
0% |
|
Cholesky Candidate
|
no |
|
Positive Definite
|
no |
|
Type
|
real |
| SVD Statistics |
| Matrix Norm |
2.671478e+00 |
| Minimum Singular Value |
8.670271e-01 |
| Condition Number |
3.081193e+00
|
| Rank |
66 |
| sprank(A)-rank(A) |
0 |
| Null Space Dimension |
0 |
| Full Numerical Rank? |
yes |
| Download Singular Values |
MATLAB
|
| Download |
MATLAB
Rutherford Boeing
Matrix Market
|
| Notes |
An infeasible Netlib LP problem, in lp/infeas. For more information
send email to netlib@ornl.gov with the message:
send index from lp
send readme from lp/infeas
The lp/infeas directory contains infeasible linear programming test problems
collected by John W. Chinneck, Carleton Univ, Ontario Canada. The following
are relevant excerpts from lp/infeas/readme (by John W. Chinneck):
In the following, IIS stands for Irreducible Infeasible Subsystem, a set
of constraints which is itself infeasible, but becomes feasible when any
one member is removed. Isolating an IIS from within the larger set of
constraints defining the model is one analysis approach.
PROBLEM DESCRIPTION
-------------------
FOREST6, WOODINFE: very small problems derived from network-based
forestry models. The IIS in FOREST6 includes most of the rows.
WOODINFE is the example problem discussed in detail in Greenberg [1993],
and has a very small IIS. Contributor: H.J. Greenberg, University of
Colorado at Denver.
Name Rows Cols Nonzeros Bounds Notes
forest6 67 95 270 B
REFERENCES
----------
H.J. Greenberg (1993). "A Computer-Assisted Analysis System for
Mathematical Programming Models and Solutions: A User's Guide for
ANALYZE", Kluwer Academic Publishers, Boston.
|
