[Coin-lpsolver] Using Clp Executable

[John J Forrest]

Added a newline in clp



Math407 Summer05 <m407s05 at u.washington.edu> 
Sent by: coin-lpsolver-bounces at list.coin-or.org
06/17/2005 06:20 PM

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[Coin-lpsolver] Using Clp Executable







I am having trouble using the Clp executable both directly and through 
Neos. Below you will find an e-mail message that I sent Neos followed by 
the Clp results as relayed by Neos. The problem I am trying to solve and 
the solution are listed in the comments in the e-mail sent to Neos. Here 
are my questions:

1. Is my MPS input file correct (given the problem I am trying to solve). 
If not, what have I done wrong ?

2. What is the meaning of the solution output generated by Clp and where 
is this documented ?


%%%%%%%%%%%%%%%% E-mail sent to Neos %%%%%%%%%%%%%%%%%%%%%%%%%%
type lp
solver clp-mps
BEGIN.COMMENT
Example 2.4.3 in Paul Tseng's notes Math 407: Linear Optimization
maximize    x1   +      x2
subject to  x1   +  1.5*x2 <= 30
             2*x1 +      x2 <= 40
                         x2 <= 14
               x1 ,      x2 >= 0

The solution is x1 = 15, x2 = 10
END.COMMENT
begin.mps
*Ke Name0---  Name1---  Value1------
*23 56789012  56789012  567890123456
NAME           T-2.4.3
ROWS
  N         z
  L        r1
  L        r2
  L        r3
COLUMNS
           x1         z            1.
           x1        r1            1.
           x1        r2            2.
*
           x2         z            1.
           x2        r1            1.5
           x2        r2            1.
           x2        r3            1.
RHS
           b1        r1           30.
           b2        r2           40.
           b3        r3           14.
ENDATA
end.mps

BEGIN.PAR
maximize
primalSimplex
solution -
END.PAR
%%%%%%%%%%%%%%%% E-mail sent to Neos %%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%% CLP Results %%%%%%%%%%%%%%%%%%%%

Load Avg: ( 0.0 , 0.0 , 0.0 )
Coin LP version 1.00.01, build Oct 18 2004
At line 3 NAME           T-2.4.3
At line 4 ROWS
At line 9 COLUMNS
At line 18 RHS
At line 22 ENDATA
Problem T-2.4.3 has 3 rows, 2 columns and 5 elements
Model was imported from ./clp.mps in 0 seconds
Switching to line mode
Clp:Clp:Presolve 0 (-3) rows, 0 (-2) columns and 0 (-5) elements
Empty problem - 0 rows, 0 columns and 0 elements
Optimal - objective value 0
After Postsolve, objective -0, infeasibilities - dual 0 (0), primal 0 (0)
Optimal objective -0 - 0 iterations time 0.002, Presolve 0.00
Clp:      0 r1                    0                     -0
       1 r2                    0                    0.5
       2 r3                    0                    0.5
       0 x1                    0                      0
       1 x2                    0                      0
Clp:

%%%%%%%%%%%%%%%%%%%% CLP Results %%%%%%%%%%%%%%%%%%%%
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