[OS] Understanding linearConstraintCoefficients markups

[Kipp Martin]

Hi Joe:

Thanks for your interest. I attach two files. The first file is 
lp_solve_ex.osil which is an osil example file for your  LP.  I ran it 
and also attach lp_solve_ex.osrl which is the answer. It appears that 
the answer is

x0 = 1
x1 = 0
x2 = 99
x3 = 71

with optimal objective function value 71.

Cheers

> 
> Maybe someone could help me to convert a small (only 4 variables, 2
> constraints, 1 objective) lp_solve/file into OSiL (the contents of
> small.lp is paste on the end of this message). Please find my attempt
> for OSiL formulation (actually, OSSolverService crashes on parsing
> this file) :
> 
> #broken-small.osil ; usage : OSSolverService -osil broken-small.osil
> <?xml version='1.0' encoding='UTF-8'?>
> <osil xmlns='os.optimizationservices.org'>
>  <instanceHeader>
>   <name>My broken example</name>
>   <source>Manually written</source>
>   <description>Any comments</description>
>  </instanceHeader>
> 
> <!-- Objective -->
> <objectives numberOfObjectives='1'>
>  <obj name='Example objective' maxOrMin='max'  numberOfObjCoef='1'>
>   <coef idx='3'>1</coef>
>  </obj>
> </objectives>
> 
> <!-- Constraints -->
> <constraints numberOfValues='2'>
>  <con ub='0' lb='0'/>
>  <con ub='100'/>
> </constraints>
> 
> <linearConstraintCoefficients numberOfValues='4'>
>   <rowIdx><el> 0 </el></rowIdx>
>   <start> <el> 3 </el><el> 0 </el><el> 1 </el><el> 2 </el></start>
>   <value> <el> 7 </el><el> 2 </el><el> 3 </el><el> 5 </el></value>
> </linearConstraintCoefficients>
> 
> <linearConstraintCoefficients numberOfValues='3'>
>   <rowIdx><el> 1 </el></rowIdx>
>   <start> <el> 0 </el><el> 1 </el><el> 2 </el> </start>
>   <value> <el> 1 </el><el> 1 </el><el> 1 </el> </value>
> </linearConstraintCoefficients>
> 
> <!-- Declarations -->
> <variables numberOfVariables='4'>
>  <var name='X0' type='I'/>
>  <var name='X1' type='I'/>
>  <var name='X2' type='I'/>
>  <var name='X3' type='I'/>
> </variables>
> 
> </instanceData>
> </osil>
> ### end broken-small.osil
> 
> 
> The original lp_solve/LP file :
> 
> ### small.lp ; usage : lp_solve < small.lp
> /* Objective */
>  MAX: X3;
> 
> /* Constraints */
>  7 X3 - 2 X0 - 3 X1 - 5 X2 = 0;
>  X0 + X1 + X2 <= 100;
> 
> /* Bounds */
> X0 >= 0 ; X1 >= 0 ; X2 >= 0 ; X3 >= 0;
> 
> /* Declarations */
> INT   X0   X1   X2   X3 ;
> 
> ### end small.lp
> 
> 
> Thanks for any remarks on the OSiL file contents (I didn't try to make
> my OSiL file compact, it is not the aim) !
> Joe.
> 
> > 


-- 
Kipp Martin
Professor of Operations Research
and Computing Technology
Graduate School of Business
University of Chicago
5807 South Woodlawn Avenue
Chicago, IL 60637
773-702-7456
kipp.martin at chicagogsb.edu
http://gsbkip.chicagogsb.edu
http://www.coin-or.org

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