Re: [eclipse-clp-users] Begginers Querry

From: nishant raj <nishantraj5132_at_...6...>
Date: Wed, 1 Jun 2011 12:00:05 +0530
Could you please provide me an example where any problem of hybrid
optimization( MILP + CLP formulation ).
 By hybrid i mean a problem which is formulated half in MILP and half in CLP
that is where some well known constraints are treated via CLP and rest
constraints are solved via MILP.
I want an example where this type of formulation is done in Eclipse...
Thanks guys

On Fri, May 27, 2011 at 10:44 PM, Kish Shen <kisshen@...5...> wrote:

> Hi Nishant,
>
> From your questions, it would seem that you are not familiar with
> constraint programming, or programming in Prolog (ECLiPSe is Prolog with
> extensions), you really need to learn these before you think about tackling
> complex problems, especially if you intend to use an approach that will
> combine constraint programming and MIP.
>
> The ECLiPSe website (eclipseclp.org) provides links to various materials
> that you may find useful. In terms of introduction to ECLiPSe and Constraint
> Programming, you may want to refer to the books listed under the Books
> section in:
>
> http://eclipseclp.org/reports/index.html
>
> The following section (Introductory Material) also contain various
> introductory materials (slide for talks, etc.).
>
>
>
> On 26/05/2011 15:09, nishant raj wrote:
>
>  1. How to feed xls data in EClipse...like in GAMS we use database and push
>> the xls file or directly upload it....
>>
>
> ECLiPSe does not provide any specialised reader for Excel files (I assume
> that is what you mean by xls). Like other programming languages, ECLiPSe
> provide I/O facilities to read files, which you can use to read in the Excel
> files.
>
> The more important question is not how to read the file, but what do you
> want to do with the data you read in? Unlike GAMS, where you can read in
> some predefined formatted data files (which I assume what these xls files
> are), and then just apply a solver to solve it, you need to read in data and
> construct the problem model using ECLiPSe, before you can solve it.
>
> The introductory books should give you some guidance on how you can do
> this. Some of the code examples in
>
> http://eclipseclp.org/examples/index.html
>
> will also illustrate this, but you should learn at least something about
> ECLiPSe/Prolog before looking at these examples.
>
>
>  2. As every program compile and then run ...in other progamming languages
>> like C.C++,JAVA...i know how to compile..but how to run..what exactly
>> QUERY
>> is used for...
>>
>
> This is a very basic question about Prolog. A query is how you "run" a
> Prolog program, it is like calling a procedure in a more conventional
> language like C.  Again, you should read some introductory material on
> ECLiPSe and/or Prolog.
>
> One possibility is the ECLiPSe tutorial (available from the website, but
> also comes with the ECLiPSe distribution). This introduces you to various
> libraries in ECLiPSe, and there is a chapter on Prolog, but this might be
> rather dense if you have no knowledge of Prolog at all, so you may want to
> also read something like a Prolog textbook that is intended specifically to
> teach Prolog.
>
>
>     Now, suppose we want to write a code for sudoku solving...then how user
>> will input his data after compilation ....and suggest some good links to
>> study more basics...
>>
>
> Again, ECLiPSe provides the I/O facilities, as in other Programming
> Languages, that will allow you to read in such data. Alternatively, you can
> also provide the data via a GUI, using for example the Tcl/Tk or Java
> Interfaces to Prolog. I suggest starting with the basic I/O facilities
> first, and again, such topics will be covered by the introductory books to
> Prolog or ECLiPSe.
>
>
>
>  3. Can we solve standalone MILP problems with COIN-OR using Eclipse.? how
>> give me some light on this matter
>>
>
> I am not sure what you mean by "standalone MILP problems". Do you mean a
> MILP problem specified as a MPS (or some other format such as LP) file? Yes,
> the ECLiPSe interface for MILP solver (eplex) will allow you to read in a
> MPS or LP formatted file and then solve the problem. However, if this is
> what you want to do, there is little reason to use ECLiPSe.
>
> Normally, you will specify the problem model you want to solve in ECLiPSe,
> perhaps by reading in raw data files (rather than a pre-defined
> specification of a problem like MPS format), and then solve it.
>
>
>  4. How coin-or interface works in Eclipse.
>>
>
> Firstly, ECLiPSe has an interface to MIP solvers -- the eplex interface.
> This interface will work with various different solvers, including solvers
> in the COIN-OR projects, e.g. CBC/CLP.
>
> As for your question, I am not sure what you are asking. I assume you are
> not asking about the implementation details of the eplex interface.
>
> If you are asking how you can program using the eplex interface, the
> ECLiPSe tutorial has a chapter on eplex, which introduce some of the most
> basic facilities of eplex to get you started.
>
> Cheers,
>
> Kish
>
>
>> Thanks guys...Eagerly waiting for your replies.
>>
>>
>>
>>
>>
>>
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-- 
NISHANT RAJ
3rd YEAR UNDERGRADUATE STUDENT
DEPARTMENT OF INDUSTRIAL ENGG.& MANAGEMENT
IIT KHARAGPUR
Phone (+91)-7501320429
Received on Wed Jun 01 2011 - 06:30:12 CEST

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