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
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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                                         
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.