Question

我正在尝试为prolog中的总线驱动程序创建计划。我希望找到有限数量的解决方案。但我得到了"Out of local stack"错误，我想这是因为我得到了太多解决方案。

如果给出以下代码，我该如何防止该错误？无论我做得不好的任何提示都会有很大的帮助。

count_drivers: counts the number of drivers with D_id as driver_id 
( I need them to work less than "max_hours").

vehicle: represents the bus and respective routes.

connected: represents the connection between the relief opportunities 
( a route consists of a group of relief points and the respective "connection" 
between them)

workpiece: is a segment of work in the same vehicle between two relief points

spell: is a group of workpieces done by the same driver

spreadover: is the whole shift one driver has to do.

以下是代码：

?- use_module(library(clpfd)).
?- use_module(library(lists)).
?- use_module(library(aggregate)).

%workpiece(Bus,[Ro1,Ro2],Weight). 

workpiece(1,[1,2],1).
workpiece(1,[2,3],2).
workpiece(1,[3,4],1).
workpiece(1,[4,5],2).
workpiece(1,[5,6],1).
workpiece(2,[7,8],2).
workpiece(2,[8,9],2).
workpiece(2,[9,10],1).
workpiece(2,[10,11],2).
workpiece(2,[11,12],1).
workpiece(3,[13,14],2).
workpiece(3,[14,15],1).
workpiece(3,[15,16],2).
workpiece(3,[16,17],1).
workpiece(3,[17,18],2).

%spell
spell(Vehicle,[[Ro1,Ro2]|Tail]):-Vars = [Ro1,Ro2], Vars in 1..18, workpiece(Vehicle,[Ro1,Ro2],_),spell(Vehicle,Tail,Ro2),labeling([],Vars).
spell(_,[],_).
spell(Vehicle,[[Ro1,Ro2]|Tail],Ro3):- Vars = [Ro3], Vars in 1..18, Ro3 #= Ro1, workpiece(Vehicle,[Ro1,Ro2],_),spell(Vehicle,Tail,Ro2), labeling([],Vars).


%spreadover de cada driver
spreadover(_,List):- Vars = I, Vars in 1..15, length(List,I), I #>= 1.
spreadover(Driver,[Head|Tail]):- Vars = [Vehicle,I], Vars in 1..9, Vehicle #>= 1, Vehicle #=< 3, spell(Vehicle,Head), length(Head,I), I #>= 1, spreadover(Driver,Tail), labeling([],Vars).

%ocupar as workpieces todas
%minimizando os shifts
%cobrir todas as routes

%length 15
%drivershifts

drivershifts(_,List):- Vars = I, Vars in 1..15, length(List,I), I #= 15.
drivershifts(NumDrivers,[[Driver|List]|Tail]):-Vars = Driver, Vars in 1..NumDrivers, Driver #>= 1, Driver #=< NumDrivers, spreadover(Driver,List), labeling([],Vars).

我提前感谢你们，无论何时你都可以帮助我。

编辑：我改变了一点代码，现在我从查询中获得了大量未分配的变量 FORALL（spreadover（1，列表），writeln（列表））。或者一个未分配的变量 spreadover（1，列表）。我尽可能限制域名，但不确定我是否正确地执行此操作。从上面的查询中我应该为驱动程序1生成扩展（一组法术）。

我不确定是否应该发布新问题或重写此问题，因此决定重写此问题。

Answer 1

你有许多来自Singleton变量的警告，并且是解决它们的好方法。至少，您知道的前缀变量未使用下划线，以避免警告。

现在循环：你用自由变量调用图表，导致无限递归，“构造”一个部分实例化变量的无限列表。

我无法理解图表/ 1的预期含义。当然，你会错过基本情况：添加类似

的内容

diagram([]).

在prolog中的这个特定约束编程中解决“Out of local stack”

1 个答案: