[Coin-discuss] API vs modelling language

[Leo Lopes]

If I understand your problem correctly, you are asking how to
interpret a solver message such as  "x[1223] has impossible bounds" if
you didn't say what 1223 was. If that is the right question, then here
is my answer:

the modeling language keeps an internal table connecting your names to
the sequences of [variables|constraints] it creates. So if in your AML
code you declared something like:

var x{CARS};

and later you populated the set CARS from a spreadsheet with something like:

CARS = @OLE()

Then the modeling language should keep, internally, a mapping such as:

VINJ3324321324123 -> 1
VIN J456363454634 -> 2
.....
VIN K12435245345 -> 1223
.....

so that in using the modeling language, any error message sent by the
solver would be filtered so that when it arrived to you, you would see
something like:

"x[K12435245345] has impossible bounds".

Cheers,
Leo.

On 8/18/05, Michael Hennebry <hennebry at web.cs.ndsu.nodak.edu> wrote:
> On Thu, 23 Jun 2005, Leo Lopes wrote:
> [reordered]
> 
> > Michael Hennebry wrote:
> > > A reason that I almost always use an API without a modelling
> > > language is that if I don't assign index numbers myself,
> > > I don't know how to interpret them while my program is running.
> 
> > Interesting comment.  ...
> 
> How do other people's programs interpret solver output if they
> let a modelling language implementation set the index numbers?
> 
> --
> Mike   hennebry at web.cs.ndsu.NoDak.edu
> "There are three kinds of people,
> those who can count and those who can't."
> 
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-- 
========================================================================
Leonardo B. Lopes                                    leo at sie.arizona.edu
Assistant Professor                                        (520)621-2342
SIE - University of Arizona  http://www.sie.arizona.edu/faculty/leolopes