ngraph.sparse-collection
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Subset of the University of Florida sparse matrix collection
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UF Sparse Matrix Collection, Tim Davis
http://www.cise.ufl.edu/research/sparse/matrices/LPnetlib/lpi_cplex1
[]
id: 710
date: 1993
author: E. Klotz
ed: J. Chinneck
fields: title name A b id aux kind date author ed notes
aux: c lo hi z0
kind: linear programming problem
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
-------------------
CPLEX1, CPLEX2: medium and large problems respectively. CPLEX1
referred to as CPLEX problem in Chinneck [1993], and is remarkably
non-volatile, showing a single small IIS regardless of the IIS algorithm
applied. CPLEX2 is an almost-feasible problem. Contributor: Ed Klotz,
CPLEX Optimization Inc.
Name Rows Cols Nonzeros Bounds Notes
cplex1 3006 3221 10664 B dense col (> 1500)
REFERENCES
----------
J.W. Chinneck (1993). "Finding the Most Useful Subset of Constraints
for Analysis in an Infeasible Linear Program", technical report
SCE-93-07, Systems and Computer Engineering, Carleton University,
Ottawa, Canada.
