anyone wo can help me with my Netlogo project?
I build up a network of cities (linked with streets) with some infected cities within. The infected cities are trying to infect the susceptible ones over the streets (links). HERE the problem: How can i tell the healthy city to cut the connection with the infected city?
Grateful for each hint.
Greets,
Yannick
How about making the infected links change an attribute of the links they have. Like:
links-own [infected-link]
ask cities with [infected? = "yes"][
ask my-links [set infected-link = "yes"]]
then you can have disease-free cities
ask my-links with [infected-link = "yes"] [die]
at whatever rate or opportunity you'd like.
Related
This is the code of a 2 player game that I manipulated
o play-the-game
if (any-friends-nearby?) [gain-energy]
if (any-opponents-nearby?) [fight-opponent]
end
to-report any-friends-nearby?
report (any? (turtles-on neighbors4) with [breed = [breed] of myself])
end
to-report any-opponents-nearby?
report (any? (turtles-on neighbors4) with [breed != [breed] of myself])
end
to gain-energy
set similar-nearby count ( turtles-on neighbors4 )
with
[color = [color] of myself]
set total-nearby count (turtles-on neighbors)
;
;
if (similar-nearby >= total-nearby - similar-nearby)
[set energy energy + 5]
end
to fight-opponent
let my-breed [breed] of green-players
let my-color [color] of green-players
let opponent-breed [breed] of red-players
;
;;
ask my-breed
[check-random-winner]
end
to check-random-winner
let pick random-float 2
let winner nobody
ask turtles
[if winner = nobody
[ ifelse size > pick
[set winner self ]
[set pick pick - size] ] ]
end
to change-opponent
ask red-players
[ set breed green-players
set color green ]
end
Sorry if it's a bit long but when I setup up and then press go "ASK expected input to be an agent or agentset but got the list [green-players...]"
How can I fix this?
Also I'm very new to Netlogo and StackOverflow, apologies if I haven't asked my question properly.
The error message tells you that you are passing a list (more specifically, a list of breeds) to ask, when it comes to ask my-breed.
This is because the my-breed local variable is determined by
let my-breed [breed] of green-players
Let's see what we have there:
breed is a turtles-own variable: it holds the turtle's breed, and being an agents' variable can be used as a reported in the of construct (see below).
of is a reporter: it takes a reporter (normally an agents' variable) on its left (in your case: breed) and either an agent or an agentset on its right (in your case: green-players). What of reports (i.e. what it outputs) is...
... a single value if there is an agent on the right.
... a list of values if there is an agentset on the right*.
*Think about it: if I ask the color of your eyes (you are a single person, i.e. a single agent), you will tell me a single color. But if I ask the color of your friends' eyes (your friends are a group of people, i.e. an agentset), the only way for you to answer my question is to tell me a list of colors.
green-players is an agentset: all of the agents whose breed is green-players (note that for NetLogo green-players is an agentset even if it contains 1 or 0 agents).
From this, we can see that in this case of reports a list of breeds, because it reports the breed of every agent that is part of green-players, hence it will report the list [green-players green-players green-players green-players ... ] which is as long as the number of green-players in the model. You can verify this by clicking setup and then running [breed] of green-players in the Command Center.
This is a list of breeds (which can also be seen as a list of agentsets), which is not an agent or an agentset (which are the only possible targets of ask).
((note that the exact same thing happens with let my-color [color] of green-players and let opponent-breed [breed] of red-players))
So, how do you construct an agentset based on a variable? The most common way to do it is by using with (read here why).
But how can you fix your code? I don't know because I don't understand what you want to achieve.
I am not sure how you would want to use it in the code you posted, as I'm not even sure you need to use ask in fight-opponent (let alone ask an agentset).
Your fight-opponent procedure is such that, apart from the problem we just discussed, the "my-" things (i.e. my-breed and my-color) always refer to the green players while opponent-breed always refers to the red players - even if fight-opponent is run by a red player! And also, it is not clear what you want to achieve with the check-random-winner procedure and if you want this procedure to be ran by an entire breed. These things make it quite confusing to understand how you could want to fix the fight-opponent procedure.
For example: who do you want to run the check-random-winner command?
A combination of two things would be beneficial: develop your model one step at a time and make sure that every new little piece of code does exactly what you expect it to do; also, when you ask for how to fix something it is useful that you explain what you want your code to do. By doing these two things I believe it will be a lot easier to answer your questions
I am building a model in Netlogo where I am simulating the spread of a virus. I have looked at other virus models but so far haven't found a solution to my problem.
I would like each agent interaction to have a specific transmission-probability, based on the susceptible agent's susceptibility (agent attribute), the infected agent's (can be more than one) probability of transmitting the virus (agent attribute), as well as the time spent in proximity. Basically P(getting infected)= infectivity * time in proximity * susceptibility. So for each tick that a susceptible turtle is close to a infected one the probability of getting infected should increase. So far I have only managed to use susceptibility when creating the procedure with susceptible agents as callers.
Here is my code for this procedure so far:
to transmit; procedure for transmitting the disease to nearby people, inspired by epiDEM
let caller self ; adress the susceptible turtle by the name caller
if susceptible? = TRUE
[
let nearby-infected turtles in-radius 2 with [infected? = TRUE]
if nearby-infected != nobody
[
let transmission-risk age-susceptibility ;here I want to include protective-measures (attribute of the possibly several infected turtles) and time-exposed
if random-float 1 < transmission-risk[
set infected? TRUE set susceptible? FALSE]
]
]
end
I am really having a hard time on how to go about this, I am not sure how to address the attributes of the turtles within the radius and how I could measure the time of exposure. I was thinking of creating links that have exposure time as an attribute that will die when the infected is no longer in the radius. But I am not sure how to ask the links to die when the turtles are further away from each other than a 2 patch radius. Also I would prefer to not use links to keep the model runnning faster so if there is another solution I would be very happy to hear it :)
For the option with the links I wanted to try something like this:
to transmit; procedure for transmitting the disease to nearby people
ifelse link-neighbors (in-radius 2 = FALSE)
[ask link [die]]
[set link-age link-age + 1]
let caller self ; adress the susceptible turtle by the name caller
if susceptible? = TRUE
[
let nearby-infected turtles in-radius 2 with [infected? = TRUE]
if nearby-infected != nobody
[create-links-with nearby-infected
let transmission-risk age-susceptibility ;include protective-measures and time-exposed using links to address the turtles
if random-float 1 < transmission-risk[
set infected? TRUE set susceptible? FALSE]
]
]
However I for starters just don't understand how to address the links of the turtles further away to ask them to die, I have changed it after the error messages I've gotten but just can't seem to get it to work.
Is it even possible to do what I want in Netlogo?
Very thankful for any hints!
The final part of my design involves me recording down anytime a car breed drives into or in netlogo terms, is on the same patch or X and Y coordinate as the people breed as they navigate across the edge of the screen. Had this been java I could've done something like
if Car.xPostion == Person.xPostion
(Do something...)
But unfortunately I do not know how to do the same in NetLogo, all I've been able to do so far is just ask the two breeds by giving every turtle a boolean variable called movable and setting them to true and the rest to false, is there anyway I can check the two coordinates of two different turtles on Netlogo? This is all I 've been able to do so far.
to record-accidents
ask turtles with [movable? = true]
[
]
If you tried something like your java approach, it would fail because turtle positions are continuous and floating numbers are nearly always not equal.
If I have understood your question correctly, you have given a boolean variable called movable? set to true for cars and false for all other breeds. You don't need to do this, turtles know their own breed so you can do ask cars.
To answer your specific question, there are several ways to approach it depending on the perspective (sort of, which agent is in charge).
You could identify patches where there are accidents:, which is the answer to your question in the title (about identifying patches with two breeds).
let accident-locations patches with [any? people-here and any? cars-here]
if any? accident-locations
[ ask accident-locations
[ <do something>
But you can also take a turtle perspective. You could start from pedestrians who have been hit. This takes advantage of the fact that turtles can automatically access the patch variables (like turtles-here) for the patch where they are located:
let hit people with [any? cars-here]
if any? hit
[ ask hit...
or from cars:
let hitters cars with [any? people-here]
if any? hitters
[ ask hitters...
I am brand new to Netlogo and am coding a world with caching animals. They will go to their caches (I set them as blue patches) if their energy value falls below 10. They can find these caches based on a random 'memory' value given to them which is used as an in-radius value. That way, they will face and go towards a cache within their in-radius memory if they are about to die. I am starting to incorporate a home-base system where the turtle remains in a smaller area with their own caches. Does anyone know how I can make a patch belong to an individual turtle? This would allow turtles to have their specific caches in their territory. I have looked into using links and breeds, but links are only between turtles and making the individual breeds for the 50+ turtles at a time seems ineffective and complex. I apologize I don't have any code attempting to have a cache (patch) belong to a turtle, I don't know where to start. Any ideas?
If you want a turtle to remember anything (patches or income or anything else), then you need to assign a variable in a turtles-own statement and then set the value appropriately. Here's some example code fragments. They won't work, and you actual code would likely look a lot different because you will need some design about the conditions under which a cache will be assigned, but they show you what a variable solution looks like.
turtles-own
[ my-caches
]
set my-caches (patch-set my-caches patch-here) ; code when a turtle finds a new cache site
If you want a patch that belongs to a turtle to make that patch unavailable to other turtles, then also set up a patch variable to store its owner.
patches-own
[ my-owner
]
ask turtles
[ if [my-owner] of patch-here = nobody [set my-caches (patch-set my-caches patch-here)]
ask patch-here [set my-owner myself]
]
I suggest you do several NetLogo tutorials, then look at some library models (and understand them) before starting your own model. You need to understand basic concepts like turtles/patches, variables, ticks before trying to build a model.
I am working on a flocking model with subgroups of agents that form temporary aggregations. I would like to quantify these subgroups by identifying them with a unique ID and a color. Thus I included the following subprocedure (chain-rule) in the go procedure, right before the tick:
to chain-rule
clear-links
ask turtles [
create-links-with other turtles in-radius distance-chain-rule
ask link-neighbors [
set subgroupID [subgroupID] of myself
set color 5 + 10 * subgroupID
]
]
end
This procedure is correctly linking only those agents within a certain distance, and because links die, it only links agents within what I want to call a subgroup (which is a temporary aggregation). The problem is the labelling: if they just acquire the subgroupID of their neighbors, eventually they all end up with the same subgroupID (and color), regardless of whether the agents still belong to the same temporary aggregation. How to update this labelling just like the links? Thanks in advance.
This is the solution I found with help by JenB, using the network extension's nw:weak-component-clusters. This procedure identifies, on each tick, the weak components of a network of agents linked by a given distance.
extensions [ nw ]
to chain-rule
clear-links
ask turtles [ create-links-with other turtles in-radius distance-chain-rule ]
set subgroups nw:weak-component-clusters
show subgroups
end