[starlogo-users] Traffic simulation question

[Gordon McDonough]

Pablo, 
	I would try placing a patch (with a slightly different color,
or addressed through its x and y coordinates) where you want the
cars to start and in Observer code, ask-patches [if . . .
[sprout[]]] my cars.  If you need to give each car a number, try
creating a global variable that is incremented at each sprout
and then assigned to the sprouted turtle's variable.
	I am sure someone else knows a more elegant way, but that is
one of the beauties of StarLogo!

Gordon
"Pablo E. Coll" wrote:
> 
> Dear Starlogoers,
>                  I am new using Star Logo.
> I am trying to simulate a single traffic lane with a
> source of uniform random vehicles in the beginning of
> the lane and a sink of vehicles on the end.
> All attempts to produce such behaviour where unsuccessful.
> 
> this is part of my last code
> I create cars with frecuency aproximately 1/3
> and then put them with, this two lines, in the beginning of the lane
>   seth-of lastCar 90
>   setx-of lastCar -99
> But after short number of cycles something goes wrong and no more cars
> are born, or at least, no more cars cames from the beginning of the lane
> 
> to go
> createCars
> ask-turtles[
>   moveDemon
>   collisionDemon
>   radarDemon
>   killCars
>   ]
> end
> 
> to createCars
> if (random 100) < 33 [
>   create-turtles 1
>   setlastCar lastCar + 1
>   setc-of lastCar yellow
>   seth-of lastCar 90
>   setx-of lastCar -99
>   setstepSize-of lastCar 1 + (0.1 * random 16)
>   setspeedLimit-of lastCar 3 + random 8
>   setdangerDistance-of lastCar 4
>  ]
> end
> 
> I will be very thankful for any advice on this question.
> If some one wants to see all my code please write me.
> Thanks in advance.
> ++Pablo;
> 
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-- 
Gordon McDonough 
Santa Fe, New Mexico, USA
http://users.hubwest.com/gordo