%-------------------------------------------------------------------------------
% UF Sparse Matrix Collection, Tim Davis
% http://www.cise.ufl.edu/research/sparse/matrices/LPnetlib/lp_perold
% name: LPnetlib/lp_perold
% [Netlib LP problem perold: minimize c'*x, where Ax=b, lo<=x<=hi]
% id: 653
% date: 1989
% author: N. Gould
% ed: D. Gay
% fields: title name A b id aux kind date author ed notes
% aux: c lo hi z0
% kind: linear programming problem
%-------------------------------------------------------------------------------
% notes:
% A Netlib LP problem, in lp/data.  For more information                        
% send email to netlib@ornl.gov with the message:                               
%                                                                               
% 	 send index from lp                                                          
% 	 send readme from lp/data                                                    
%                                                                               
% The following are relevant excerpts from lp/data/readme (by David M. Gay):    
%                                                                               
% The column and nonzero counts in the PROBLEM SUMMARY TABLE below exclude      
% slack and surplus columns and the right-hand side vector, but include         
% the cost row.  We have omitted other free rows and all but the first          
% right-hand side vector, as noted below.  The byte count is for the            
% MPS compressed file; it includes a newline character at the end of each       
% line.  These files start with a blank initial line intended to prevent        
% mail programs from discarding any of the data.  The BR column indicates       
% whether a problem has bounds or ranges:  B stands for "has bounds", R         
% for "has ranges".  The BOUND-TYPE TABLE below shows the bound types           
% present in those problems that have bounds.                                   
%                                                                               
% The optimal value is from MINOS version 5.3 (of Sept. 1988)                   
% running on a VAX with default options.                                        
%                                                                               
%                        PROBLEM SUMMARY TABLE                                  
%                                                                               
% Name       Rows   Cols   Nonzeros    Bytes  BR      Optimal Value             
% PEROLD      626   1376     6026      47486  B    -9.3807580773E+03            
%                                                                               
%         BOUND-TYPE TABLE                                                      
% PEROLD     UP LO FX FR                                                        
%                                                                               
% Nick Gould supplied PEROLD, from the Harwell collection of LP test problems.  
%                                                                               
% Bob Bixby reports that the CPLEX solver (running on a Sparc station)          
% finds slightly different optimal values for some of the problems.             
% On a MIPS processor, MINOS version 5.3 (with crash and scaling of             
% December 1989) also finds different optimal values for some of the            
% problems.  The following table shows the values that differ from those        
% shown above.  (Whether CPLEX finds different values on the recently           
% added problems remains to be seen.)                                           
%                                                                               
% Problem        CPLEX(Sparc)          MINOS(MIPS)                              
% PEROLD      -9.3807552782E+03    -9.3807553661E+03                            
%                                                                               
% Concerning the problems he supplied, Nick Gould says that  PEROLD "is         
% another Pilot model (Pilot1)".                                                
%                                                                               
% Added to Netlib on  6 April 1989                                              
%                                                                               
%-------------------------------------------------------------------------------
