create turtles and move to a position in a radius of another breed agent - netlogo

Question

I would like to create some turtles in a radius of another breed agent.
I have this example code:
breed [ readers reader ]
undirected-link-breed [ rris rri ]
breed [ tags tag ]
to setup
clear-all
set xy-file "locations.txt"
setup-readers
setup-tags
end
to setup-readers
create-readers num-readers [
set shape "circle"
set color white ; means idle state 'red' is active
setxy random-xcor random-ycor
]
end
to setup-tags
create-tags tag-population [
setxy random-xcor random-ycor in-radius 6 of one-of readers
]
end
The line setxy... to place the tags in a circle of distance 6 from one of the readers it does not work, but I do not know how to fix it. I have also tested move-to primitive without good result.
What I would like is to have a population of tags in a radius of each reader and if possible select the number of tags for each reader to be different.

Answer 1

The sprout primitive might get you what you need- instead of creating your tags and then moving them, just have the appropriate patches spawn them directly. For example, with this setup:
breed [ readers reader ]
breed [ tags tag ]
to setup
clear-all
setup-readers
setup-tags
reset-ticks
end
to setup-readers
create-readers 5 [
set shape "circle"
set color white
setxy random-xcor random-ycor
]
end
You can make a population of patches that are within the radius of readers and have however many you like sprout a tag:
to setup-tags
let radii-patches patch-set []
ask readers [
set radii-patches ( patch-set radii-patches patches in-radius 6 )
]
; Code above defines the patch-set of patches within 6 of readers
; Then, just ask 10 of those radii patches to sprout a tag
ask n-of 10 radii-patches [
sprout-tags 1
]
end
If you are doing this on a per-reader basis and you want each to have a different number of tags, you could try something like:
to setup-tags-reader
let n-tag random 5
ask readers [
ask n-of n-tag patches in-radius 6 [
sprout-tags 1
]
]
end
but then set the n-tag value some other way (for example, from another .csv file as you seem to be setting reader location).
Side note- when you post on here try to strip out any code than cannot be directly copied and pasted into Netlogo by other users (eg the 'xy-file' line, the tag-population and num-readers variables)- it just makes things super simple!
Edit
As per your comment- try this option (using the same setup as above)
to setup-tags
create-tags 10 [
move-to one-of readers
rt random-float 360
fd random-float 6
]
end
This just creates tags, moves them to a reader, has them randomly select a direction, then has them step forward a random amount from 0 to 6.
As to how to assign patches to each reader- just make a readers-own variable then have them assign patches to that variable in their setup (eg, set my-patches patches in-radius 6). You could do a similar thing with tags to define a reader-specific set of tags (eg `set my-tags tags in-radius 6). Note that in both cases you can get overlap where two readers share patches/tags- you will have to account for that.