Is there a way to exclude the previous patch a turtle was on from its neighborhood?

[Victoria Haskins]

I'm trying to make my turtles build roads. I want them to turn the patch they're on grey and die if they're on a grey patch or if any of their neighbors4 are grey (because this means they have already connected to the larger road network). 

However, if I just use neighbors4, then the turtle will die as soon as it moves forward once because the patch it was just on is now grey. 

I feel like I've tried absolutely everything. 

ask turtles [

let adjacent-patches neighbors4 
if any? adjacent-patches with [ pcolor = grey ]
[ die ]

fd 1

]

--> results in the turtle dying after moving forward once because the patch it just moved from is part of neighbors4

I've done let adjacent-patches neighbors4 with [ self != previous-patch ]

--> I can't use previous-patch in a patch context, because it's turtles only (even though it's in ask turtles

 let adjacent-patches neighbors4 with [ not member? self previous-patch ] --> also doesn't work

[Jacob Kelter]

Where is previous-patch defined? If it is a turtle variable, then you would need:

let adjacent-patches neighbors4 with [ self != [previous-patch] of myself ]

That should work because myself refers to the asking turtle. 

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[S Nezhadi]

Ensuring Proper Pairing of Patch Variables When Calculating Correlation in NetLogo

Dear NetLogo Users,

I am currently working on a spatial model in NetLogo where I need to compute the correlation between crop-land (CL) profit and CL pest density at the patch level. However, I want to ensure that each profit value is correctly matched to the corresponding pest density from the same patch before performing the correlation calculation.

  I want to verify that the NetLogo list extraction process maintains the correct pairing of profit and pest density for each patch.

Questions:

1. Does NetLogo maintain the same order when extracting multiple variables from an agentset using map and sort?
2. Is there a better way to ensure the correct alignment between profits and pest densities when working with patch data?
3. Would it be more reliable to store these values as patch variables first and access them directly later instead of using lists?
4. Are there known issues where sorting patches causes misalignment between extracted values in separate lists?

Any guidance, suggestions, or best practices to ensure the correct pairing of profit and pest values per patch before calculating correlation would be greatly appreciated!

Thank you!

Best regards,

Sogol 

To view this discussion visit https://groups.google.com/d/msgid/netlogo-users/CAB-K8iHBm1m0JEDOQ5b-8GL2J27zwxNDAyX7hZfRoLdubpNhaA%40mail.gmail.com.

[Jacob Kelter]

Without knowing anything else about your model I would recommend storing these values as patch variables. Then you can calculate correlation with something like:

[correlation-function profit pest-density] of patches

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[Victoria Haskins]

Thanks, this worked!

[Aaron Andre Brandes]

Hi,

Although it’s not the best tool for your problem the primitive other is sometimes useful for excluding a turtle or patch from an agentset.

• Aaron

 

 

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Aaron Brandes, Software Developer

Center for Connected Learning and Computer-Based Modeling

 

 

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