Re: [eclipse-clp-users] amount of shallow backtracking.

From: Kish Shen <kisshen_at_...5...>
Date: Tue, 12 May 2009 04:03:52 +0100
mauricio montecinos wrote:

> 
> Actually, I wanted to calculate the number of times that the algorithm
> attempts assigns a value to a variable and the constraint propagation fails,
> because the domains of non-instantiated variables are filtered and some
> domain becomes empty then a next value is tried.

You may be able to use the coverage library (described in the Tutorial 
chapter "Program Analysis") to give you some idea of the failure rate of 
a goal, and by explicitly assigning the value, you should get some idea 
of the failure rate, something like:

label(Var) :-
     my_indomain(Var, Val), % value selection
     Var = Val.

the coverage library will add counters between the goals, and difference 
between the entry and exit counters for the Var = Val goal should give 
you the number of failures of Var = Val.

Cheers,

Kish


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Received on Tue May 12 2009 - 03:04:03 CEST

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