Re: [eclipse-clp-users] Program Does not Load

From: Kish Shen <kisshen_at_...5...>
Date: Wed, 03 Feb 2010 13:04:34 +0000
Hi Amine,

Amine Marref wrote:
> Thanks everyone,
> I can now compile the program and run it.
> This program is just about a tenth of the size of my target problems in future. It seems that I will sooner or later not be able to compile programs like this.
> The size of the current program can be reduced by using loops to specify domains and constraints on sublists of variables. This however, only applies to this case. Eventually, each single variable will have a domain and a set of constraints which are potentially different from all other variables, so I guess this flat modeling is necessary.
> I did not quite get the idea about the data file which should contain only "numbers". How can I get around the problem of needing to declare variables individually (and their distinctive set of constraints) by using a data file?

ECLiPSe is a general programming language, and it has all the constructs 
needed to write a "non-flat" program. How are you generating your 
current programs? I assume you have some sort of data that your program 
generator reads?

For example, in your components program, I notice that you have various 
variable types, for the "EDGES", you have variables like E_21_27, etc. 
How are these represented in your original data, or in your program 

In ECLiPSe, there are various ways of storing a collection of related 
variables, e.g. your EDGES variables. For example, assuming your 21 and 
27 are array indexes, you can store them in a 2-D matrix. If your matrix 
is sparse, you can use a hash-table (lib(hash)) to store the data. You 
access a matrix element using its indexes, and you use a key (unique to 
the variable, so say something like edges21_27 for this example) to 
access the variable in a hash-table.

So for the domain of each specific variable, you can put an entry that 
gives the domain for each variable, e.g.

edges 21 27 0 1000

where "edges 21 27" refers to your variable, and 0 and 1000 are the 
upper and lower bounds of your variable.

Of course you can have any number of variations on this -- I assume you 
already have some format to specify your data. What you need to do is to 
write the program in ECLiPSe to read this data, instead of doing this in 
your program generator.

> P.S. How do I reply to this topic without generating new threads in the user-list archive? 

I also don't understand how the list archive decide to list the posts. 
It would be great if someone who do can post about it!



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Received on Wed Feb 03 2010 - 13:04:49 CET

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