LPnetlib/lpi_pilot4i

Netlib LP problem pilot4i: minimize c'*x, where Ax=b, lo<=x<=hi
Name lpi_pilot4i
Group LPnetlib
Matrix ID 726
Num Rows 410
Num Cols 1,123
Nonzeros 5,264
Pattern Entries 5,264
Kind Linear Programming Problem
Symmetric No
Date 1993
Author J. Stone
Editor J. Chinneck
Structural Rank 410
Structural Rank Full true
Num Dmperm Blocks 9
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 5.935540e+04
Minimum Singular Value 1.405396e-01
Condition Number 4.223392e+05
Rank 410
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/data                                                   
	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                                                         
-------------------                                                         
                                                                            
PILOT4I:  medium size problem generated by doctoring the original NETLIB    
PILOT4 model.  Contributor:  John Stone, Ketron Management Science.         
                                                                            
Name       Rows   Cols   Nonzeros Bounds      Notes                         
pilot4i     411   1000     5145   B FR FX                                   
                                                                            
Added to Netlib on Sept. 19, 1993