Re: [netlogo-devel] Movement of turtles - observer context error

[Bryan Head]

Hi Sara,

It’s awesome that you’re working in NetLogo. However, this list is reserved for discussing technical matters regarding how NetLogo’s build and operations. For modeling questions, the best resources are the netlogo-users Yahoo group and/or asking a question on Stackoverflow.

As a quick answer though: the problem is that this line isn’t being run in a turtle context: if (sex = 0 and age = 1 and employment = 0 and household-size = 0) [move-work], since I assume sex and age are citizen variables. But simply putting those in the ask citizens won’t work since move-work already ask citizens, so you’d get all citizens asking all citizens to do stuff, which you obviously don’t want. So, instead of putting ask citizens in Do_7AM_9AM, start-movement, or move-work, I recommend changing your go procedure to do ask citizens [ find-day-activities ].

Best,
Bryan

​

On Wed, Apr 4, 2018 at 4:57 AM Sara Alonso Vicario <saralons...@gmail.com> wrote:

Hi, 

I am working on a model in NetLogo to move citizens around a city to different places in different schedules. I just starting and I am trying to move the citizens which particular characteristics to a patch grey (that represents a work area). However, I have a problem with the find-day-activities command. The error is the following: You can not use find-day-activities in observer context, because find-day-activities is turtles only.

I already checked on internet solutions and I know it is related to the context, for this reason, I included ask citizens command to Do_7AM_9AM, start-movement and move-work to move from turtle context to observer context but the error persists.

Here is my code, someone could help me?

Thank you in advance,

Sara

to go

set-timekeeper

find-day-activities

end

to set-timekeeper

tick ;Advances the tick counter by one and updates all plots.

let counter ticks ;Reports the current value of the tick counter.

  if (counter = 1) [set timekeeper 1] ;Before 7:00 AM

  if (counter = 2) [set timekeeper 2] ;From 7:00 AM to 9:00 AM

  if (counter = 3) [set timekeeper 3] ;From 9:00 AM to 13:00 PM

  if (counter = 4) [set timekeeper 4] ;From 13:00 AM to 14:30 PM

  if (counter = 5) [set timekeeper 5] ;From 14:30 AM to 17:00 PM

  if (counter = 6) [set timekeeper 6] ;From 17:00 AM to 20:30 PM

  if (counter = 7) [set timekeeper 7] ;After 20:30 PM

end

to find-day-activities

if (timekeeper = 2) [Do_7AM_9AM]

end

to Do_7AM_9AM

ask citizens 

[start-movement]

if (sex = 0 and age = 1 and employment = 0 and household-size = 0) [move-work]

end

   

to start-movement

ask citizens

[let nearest-node min-one-of nodes [distance myself]

set slocation nearest-node

move-to slocation]

end

to move-work

ask citizens 

[let work-patches (patch-set patches with [pcolor = grey])

let new-location one-of [link-neighbors] of (patch-set patches with [pcolor = grey])

move-to new-location

set slocation new-location]

end 

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[Sara Alonso Vicario]

Thank you, sorry. I will ask in the other group!

[u...@northwestern.edu]

Hi Sara,

Glad that the shape file issue was resolved.

For queries such as the one copied below, we suggest users send to netlog...@yahoogroups.com, a much larger group of users, who can answer such questions.

All the Best,

—Uri

Uri Wilensky