Where to put "stop" to end the simulation - netlogo

Question

I want to stop my simulation if there is no certain patch (target) to occupy. I did the following code but still not working. It just stopped the turtle, not the simulation. I did this "target" variable as globals and to include it in "go" but also cannot stop the simulation.
to set-move
ask migrants
[set pot-target patches with [value < 11 and not any? turtles-here]
set target pot-target with [count neighbors with [any? turtles-here with [value < 11]] >= 1]
ifelse (count target != 0 and (status != "resident")) [move-to min-one-of target [value]
set status "resident"
set color blue]
[stop]
]
Here is the full code
breed [migrants migrant]
breed [residents resident]
patches-own [value]
turtles-own [income
status]
to setup
ca
let total problo + probmid + probhi
if (total != 100)
[print (word "prob is more than 100")]
ask patches [set value random-normal 10 3
let patch-value value
set pcolor scale-color (gray - 5) patch-value 10 3]
ask patches
[if random 100 < 3
[sprout-residents 1
[set color red
set shape "default"
set size 1
set status "resident"
]
]
]
end
to go
ask patches
[if not any? patches with [value < 11 and not any? turtles-here] [stop ]
if random 100 < 1
[sprout-migrants 1
[set color green
set shape "default"
set size 1
set status "migrant"
set-move
]]]
end
to set-move
let pot-target patches with [value < 11 and not any? turtles-here]
let target pot-target with [count neighbors with [any? turtles-here with [value < 11]] >= 1]
if any? target and (status != "resident")
[ move-to min-one-of target [value]
set status "resident"
set color blue
]
end

Answer 1

The primitive stop will terminate the code block within which the stop appears. In your code, once the condition is met, the set-move procedure will end, but that doesn't end the simulation. What you need to do is test for the condition at the top level (the go procedure) and that will terminate the run. I'm a little confused by your code, but I think the answer is to separate the moving part from the checking whether to stop.
So, in set-move change:
ifelse (count target != 0 and (status != "resident"))
[ move-to min-one-of target [value]
set status "resident"
set color blue
]
[ stop ]
simply to an if block instead of ifelse (removing the stop as well). Then, at the top level, add a line something like:
if not any? patches with [value < 11 and not any? turtles-here] [stop]
I'm also concerned by your code structure of set-move starting with ask migrants. I suspect that this is an error. What you are saying is, any time set-move gets called, ALL the migrants try and move. I think you intended that only the newly created migrant tries to move since you called this from within the sprout code block. If so, then your set-move is a turtle procedure and should look like:
to set-move
set pot-target patches with [value < 11 and not any? turtles-here]
set target pot-target with [count neighbors with [any? turtles-here with [value < 11]] >= 1]
if any? target and (status != "resident")
[ move-to min-one-of target [value]
set status "resident"
set color blue
]
end
Note that I also changed your count != 0 to not any? as a readability suggestion. Personally, I would also name the agentset targets rather than target to remind yourself that it may have multiple members.
UPDATE: You need to have your stop at the top level of the go procedure so that it stops that procedure. It should look something like this:
to go
if not any? patches with [value < 11 and not any? turtles-here] [stop ]
ask patches
[ if random 100 < 1
[ sprout-migrants 1
[ set color green

Answer 2

rather than using [stop] to end a simulation, I would propose you use while loop instead.
while [not stop-condition][
run
]