[Symphony] Symphony GMPL Files

[Anton Becker]

Hi Ted,

thanks for your quick reply. This is what I get for typing "bin/symphony 
-F SYMPHONY/Datasets/sample1.mod -D SYMPHONY/Datasets/sample1.dat" (I 
just defined a second objective in the sample.mod for testing)

----------------------------------------------------------------------------------------
Reading input file...

Reading model section from SYMPHONY/Datasets/sample1.mod...
33 lines were read
Reading data section from SYMPHONY/Datasets/sample1.dat...
68 lines were read
Generating nb...
Generating cost...
Generating etwas...
Model has been successfully generated

Error due to having more than one objective function!
SYMPHONY can solve problems with just one objective function

Errors in reading gmpl file

Fatal errors encountered. Exiting with code -120.
See sym_return_values.h for meaning of code.
------------------------------------------------------------------------------------------

How do I set something through the API? You mean I "load" the problem I 
want to solve (with two objective functions) through SYMPHONY first and 
then how do I set the second objective?

Cheers and best regards,

Anton

On 24.09.2012 04:11, Ted Ralphs wrote:
> Hi Anton,
>
> SYMPHONY can solve biobjective MILPs, but it's possible that the 
> interface to GLPK is not capable of dealing with multiple objectives. 
> If nothing else, you can set the second objective through the API once 
> the problem is read in. If you can provide some more details of 
> exactly when the error comes up and exactly what it says, I'll try to 
> see if it's an easy fix.
>
> Ted
>
> On Sun, Sep 23, 2012 at 4:43 PM, Anton Becker <antonbecker at me.com 
> <mailto:antonbecker at me.com>> wrote:
>
>     Hi again,
>
>     I now managed to read GMPL files.
>
>     I now encountered another problem:
>
>     1. Start symphony, works
>     2. load problem, works only with single criteria problems! Why can
>     I not read in a biobjective, linear model?! I thought this is a
>     feature of SYMPHONY.
>
>     Message is something like "Symphony can only read in single
>     objective functions".
>
>     Any ideas?
>
>     Best regards,
>
>     Anton
>
>
>     Am Sep 22, 2012 um 12:10 PM schrieb Anton Becker:
>
>     > Dear everybody,
>     >
>     > I have a problem reading GMPL files with SYMPHONY under Ubuntu
>     12.04.
>     >
>     > 1. Installed Symphony via SVN - works.
>     >
>     > 2. Installed Glpk via get.Glpk - works.
>     >
>     > 3. ./configure --with-GMPL --with-glpk-lib --with-glpk-incdir
>     --with-glpk-datadir - works.
>     >
>     > 4. make: Does not work. The compiler misses a file called amd.h.
>     I found this file and copied it into the folder the compiler
>     searched for it. (Something like Glp/src)
>     >
>     > After doing this he gave me another error, I don't remember
>     exactly what file he was missing then but I worked around this
>     error as well. This went on for hours.
>     >
>     > Did I do anything wrong? I always get new errors.
>     >
>     > In the manual there are just a few steps and it all looks very,
>     very easy.
>     >
>     > Any idea? I think there is something wrong with my installation
>     in the firs place, but I really did it step by step according to
>     the manual.
>     >
>     > It's really important for me to get this working..
>     >
>     > Best regards,
>     >
>     > Anton
>     >
>     >
>     >
>
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>
>
>
> -- 
> Dr. Ted Ralphs
> Associate Professor, Lehigh University
> (610) 628-1280
> ted 'at' lehigh 'dot' edu
> coral.ie.lehigh.edu/~ted <http://coral.ie.lehigh.edu/%7Eted>
>

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