I'm quite new to Netlogo and am having difficulty with getting the turtles to change direction. I am trying to get my turtle to walk towards a 'bed' (which is a different breed of turtle) and then once it has arrived change direction.
This is what I have tried (as well as many other possibilities!)
if location = bed 3 [
face bed 0
if turtle-here = bed 0 [
set location bed 0
forward 1
stop
]
]
if location = bed 0 [
face bed 4
if turtle-here = bed 4 [
set location bed 4
forward 1
stop
]
]
It continues further to make a cyclic path. I think the problem is that when I'm asking about 'turtle-here' it will report true or false or give me a number, when what I need is the turtles name. But I can't find any primitives that will do that.
Any Ideas??
Thanks
Naomi
Replacing if turtle-here = bed 0 with if member? bed 0 turtles-here should fix it.
Not sure what you mean by a turtle's "name".
I recommend you look at Move Towards Target Example, in the Code Examples section of the Models Library. It's extremely similar to what you're trying to do.
Related
I am trying to change a variable (score) of a particular agent in the agent set if it meets the specific condition of a patch. This is called by an another agent. To be more clear. My idea is for instance if there is a breed (horse) and it sees the patch (grass) and it is standing on another breed (vertices - since horse move along a path connected by nodes represented by vertices) - a score variable to added to vertices-own where if the grass quality <=3, it would add a score to the vertex on which it stands.
ask horses[
ask patches in-cone 50 60 [
if grass-quality <= 3 ask vertices with [min-one-of vertices in-radius 0 [distance myself] [set vertex-score vertex-score + 1 ]]]]
I know something is wrong with this code logic. I am trying to convert my mentioned thought into codes. Kindly suggest me.
Thank you all.
Regards,
Heng wah
NetLogo agent (turtle) positions are continuous numbers so it is generally wrong to try and say something like 'if another turtle is where I am'. While you may have got there using move-to, it's probably safer to have the horse identify a vertex that is very close to it rather than in the exact position. You have used radius 0 but I'm going to change that to 0.001 to allow for potential errors in position.
ask horses
[ if any? patches in-cone 50 60 with [ grass-quality <= 3 ]
[ let my-vertex min-one-of vertices in-radius 0.001 [distance myself]
ask my-vertex
[ set vertex-score vertex-score + 1 ]
]
]
]
This is not tested, but I have simply reorganised your code. You had some bracketing issues and you were also asking vertices to find the closest vertex (which would have been itself), rather than having the horse find the closest vertex.
It's also not necessary to separate the let and the ask but I thought that would be easier for you to see how it works.
I am a beginner in Netlogo and trying to setup an agent (criminal) to shoot another agent (victim) when in range. One of the problems I am facing is how to keep the bullets - when ‘hatched’ from the criminal – to keep moving in a straight line. In other words, how can I make a turtle maintain its current heading?
Below is what I have unsuccessfully tried.
Hatch-bullets 1 [ set size 0.1
set color white
set label ""
set benergy 10
fd 1
set current-heading heading
]
ask bullets [ ifelse any? humans-here with [pcolor = green]
[ hit-target die ]
[ set heading current-heading
fd 1
set benergy benergy - 0.5
set heading current-heading
ask humans-here [die]
if benergy = 0 [die]
]
I was hoping bullet-heading (variable) will store the current heading at the poing of hatching, so that it can be used later for the life duration of the bullet as it travels in a straight line (which unfortunately does not on both counts)
The other related problem is that, one bullet will be hatched per tick (or every second tick) and each bullet needs to keep track of its own heading. Bullets should be moving on a straight line rather than following the movement of the parent.
I have seen the projectile game, but the code is not helpful
I'm doing code for making agents roaming around the world to forage.
After they find it, they should stay at the patch where they find the food for a certain time. But I have a problem to make them stay on the food patch for a certain time.
Certain time: each turtle has its own variable "s", and "s" is a random number generated by NetLogo and the number shouldn't change within each tick, and I have a problem to make "s" doesn't change.
For example, turtle 1 has "s"=60, after turtle 1 find the food, it will stay on the food for 60 ticks. After turtle 1 has stayed for 60 ticks there, it will leave the food and the value of "s" will be reset again to another random value. And each turtle has a different value of "s"
I tried to use timer coding, but the timer only decreases each time the agent come across the food (like they just walk on the food instead of staying there) I can't use bk 1 or fd -1 command because the turtle just keeps on moving forward after they walk backwards for 1 tick.
Any help is appreciated.
here is the code:
turtles-own
[
food
location
s
]
patches-own
[
food-quality
]
to go
move
forage
end
to move
ask turtles
[fd 1]
end
to forage
set s random 100
ask turtles
[ [ if food < food-quality ;meaning that turtle will only keep the best food's value each time they found food
[set food food-quality ;food-quality is patch-own, the food's value
set location patch-here]
if s >= 50
[stay] ]
]
]
end
to stay
set s s - 1 ;decrement-timer
if s = 0
[move
set label ""
reset-s
]
end
to reset-count-down
set s random 100
end
Edit: making the question clearer and update some code.
I think you have a logic problem rather than a coding problem, but it's not particularly clear. If your variable 's' is supposed to be something like a stay-timer (much more descriptive name), then don't set it at the beginning of the forage procedure. Instead, set it when the turtle finds food and then only move/forage if it's not being held by the stay-timer. You also don't have tick anywhere in your code, so you are not advancing the clock. I think you want something like this:
to forage
ask turtles
[ if food < food-quality ; has found food that is more than currently owned
[ set stay-timer random 5 + 20 ; sets number of ticks to stay between 5 and 24
set food food-quality ; food-quality is patch-own, the food's value
set location patch-here
]
set stay-timer stay-timer - 1
]
end
to go
ask turtles with [stay-timer = 0] [ move ]
forage
tick
end
I'm relatively new to NetLogo, and I'm working to model moose density in New Hampshire and its correlation to winter tick parasitism.
I'd like to program my moose agents to move randomly within a set home range (~5km2), that originates from the randomly chosen patch they first enter the model on.
I'm not really sure how to bound agents based on area, rather than just patch color... Any suggestions on how to do this would be most appreciated!
Thank you!
General stackoverflow tip: typically, stackoverflow encourages specific programming questions. So including the code you've actually tried so far is generally preferred.
Alright, on to your problem.
One really simple way to do this is, first, store the mooses' starting patch. Second, when the moose is moving around, check the distance to the starting patch. If the distance exceeds the starting amount, have the moose towards the starting patch. Here's some template code to give you ideas:
breed [ mooses moose ]
mooses-own [
starting-patch
]
to setup
clear-all
;; only using one moose as it's easier to see the behavior
create-mooses 1 [
setxy random-xcor random-ycor
set starting-patch patch-here
]
reset-ticks
end
to go
ask mooses [
move
]
tick
end
to move
;; If farther than 10 patches from starting patching, take a step towards starting patch, otherwise, move randomly
ifelse distance starting-patch > 10 [
face starting-patch
] [
rt random 90
lt random 90
]
fd 1
end
In my go function I have a few conditions which might be true and then call an action, if more than one condition are true does it mean in one tick agents can do more than one action ? or in another case I have a function that agents have to move to a target and after facing the target agent should find the distance and fd 1 until reaches the target, does it mean it should take n ticks to complete?
to move [t]
face t
let n distance self t
repeat n
[fd 1]
end
to go
action 1 = > [move]
action 2
action 3
tick
end
I need the agents to do only one task at the time, and I am not sure how to make sure that for example not all the agents have the same target! sorry if these questions are out of context but I am new to Multi-agent modeling.
This is a great question!
First, specific answers:
if more than one condition are true does it mean in one tick agents can do more than one action ?
Just to be clear, are you talking about a situation like this?
to go
ask turtles [ move ]
tick
end
to move
if xcor > 5 [ fd 1 ]
if ycor > 7 [ rt 15 ]
if color = red [ bk 2 ]
end
If so, then yes, if xcor > 5, ycor > 7, and color = red are all true, the turtle will move forward 1, turn right 15, and move backward 2. The main way to prevent this is by using a sequence of ifelses:
to move
ifelse xcor > 5 [
fd 1
] [
ifelse ycor > 7 [
rt 15
] [
if color = red [ bk 2 ]
]
]
end
That way, the second condition (ycor > 7) will only be looked at if the first condition (xcor > 5) is false. Similarly, the third condition will only be looked at if the first two fail.
I have a function that agents have to move to a target and after facing the target agent should find the distance and fd 1 until reaches the target, does it mean it should take n ticks to complete?
I would recommend taking n ticks to complete it. Otherwise, only one turtle will move to its target at a time! However, repeat n [ fd 1 ] will make the turtle go forward n all at once. In fact, it's the same as fd n. The repeat block will finish before the turtle is done performing the move procedure.
You can edit your move function as follows to get it to take n ticks:
to move [t]
face t
fd 1
end
Then, just have a condition to look for when the turtle gets to its target (for example, distance t < 1) and then do something accordingly.
I recommend just messing around with these various techniques with multiple turtles using them so you can get a feel for the differences.
I am not sure how to make sure that for example not all the agents have the same target!
This depends quite a bit on context. Supposing there is a turtles-own variable called target that stores each turtle's target, you could do something like this:
to-report get-available-target [ possible-targets ]
report one-of possible-targets with [ not any? turtles with [ target = myself ] ]
end
get-available-target will report a random agent from possible-targets that is not anyone's target. one-of just gets random agent from an agentset.
How can I schedule tasks in netlogo, I have conditions and actions but how can I make the agents do one task at the time?
Often this just takes care of itself. For example, say, when an agent is hungry, it should walk over to a food supply and eat. As it's walking over, you don't want it to go off and do anything. However, it will still be hungry, so if you've used an ifelse, it will just keep going to the food supply. Thus, your agent stays focused for free! In general, it's best to design your conditions such that they remain in effect until the agent addresses them. You can order them in an ifelse chain or something similar to establish the general priority of actions (for instance, if the agent walking to the food supply is threatened by a predator, it should still run away).
If you really want to the agent to do something for several ticks, you'll basically just extend this same idea, but in a more artificial way. For instance, if an agent should walk forward three times, have a turtles-own variable set to three. If that variable is greater than zero, the agent walks forward and decreases that variable, and doesn't do anything else.
#Bryan Head already answered your question, I had the same problem when I started Netlogo and agent based modeling, So I have added a current-task variable and in my Go Procedure I have added a function to check all the conditions and set the task of agents and when the task is completed the variable is set to "" again. This might be useful for your case as well.
if current-task = "move" [move]
if current-task = "A1" [A1]
if current-task = "..." [...]
if current-task = "" [select-current-task]