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

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! > > > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users