[rules-users] How to write a rule which only fires for a closest value?

[Darko IVANCAN]

Hi,

One more thing: You might consider having different engines for
different agents, and then having the agent as global variable.

Hope this helps,
Darko Ivancan

On 09/12/2007 18:28, Darko IVANCAN wrote:
> Hi,
>
> Let's assume we have
> class Tile {
>     public int x;
>     public int y;
>     public double distance;
> }
> For the simplicity of the reader of drop the getters and setters,
>
> Rule "MyRule"
>     agent : Tile();
>     closestTile : Tile( closestDistance: distance) from agent.getTiles();
>     not Tile(this != closest; distance < clostestDistance) from
> agent.getTiles();
> ...
>
> nasty, but should do the "find closest" job.
>
> Weird, this sounds less like a rules tech/usability question to me than
> rather like a desgin question.
>
> If the answers don'T help, maybe you think about telling us the whole
> problem.
>
> hope this helps,
> Darko Ivancan
>
>
> On 06/12/2007 20:03, velven wrote:
>   
>> HI, i have a problem
>> using tileworld model, i'm supposed to write a rule which will cause the
>> agents to choose the tile in the agent's range which is closest to the
>> agent.
>>
>> so a rough idea is
>>
>> when
>>
>> agent: Agent(x1:x, y1:y, r:range)
>>
>> tile1: Tile(<tile's x to be between (x1+r) and (x1-r)> && <tile's y to be
>> between (y1+r and y1-r)>)
>>
>> tile2: not Tile( < which is closer than the tile1 to agent> )
>>
>> desperately need help,
>> alternatives tried::
>> i tried to use a query to return a list of tiles which is within the agent's
>> range then compared which one is closer and other similar implementation,
>> but this too slow for my simulation... 
>>
>> I need one single good rule or efficient way of implementing the above rule 
>>
>>
>> then i tried to do multiple constraints too, say     x (> 30 && < 40) is ok
>> but 
>>                                                                   x (>
>> ($x-$r) && < ($x+$r)) gives errors ,due to extra parenthesis? i dunno.. any
>> workarounds?
>>
>> Thanks!
>>
>>
>>   
>>     
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