Calculating average number of movement steps for dead turtles

[J]

Hello, 

 

I have a turtle variable in my model called realized-dispersal-distance that tallies the number of movement steps (1 step = 1 cell-length) that an individual takes before it either settles in suitable habitat or dies. To calculate the mean on this value across turtles in each time step I typed "mean [realized-dispersal-distance] of turtles" into the reporter box of the Behaviourspace tool. However, this  only calculates the average number of movement steps for individuals that survive. Is there a way to calculate the number of movement steps for the individuals that die as well?

I have included my code below. Thanks in advance for your help!

if (dispersal-mode = "Active - SRW" or dispersal-mode = "Active - CRW")
     [
      repeat dispersal-distance
      [
        fd 1
        set realized-dispersal-distance realized-dispersal-distance + 1  
        set heading heading + wrapped-cauchy rw-p
        if (pcolor = green and not any? other turtles-here with [age > 0])
           [
            set count-successful-settlement count-successful-settlement + 1
            set age age + 1
            stop
           ]
         if pcolor = brown
          [
           if random-float 1 < dispersal-mortality-matrix
            [
             set count-dead-matrix count-dead-matrix + 1
             die
            ]
          ]
        ]
         ifelse (pcolor = green and not any? other turtles-here with [age > 0])
          [
           set count-successful-settlement count-successful-settlement + 1
           set age age + 1
           stop
          ]
         [
          set count-dead-settlement count-dead-settlement + 1
          die
         ]
     ]

Jessica

[Pradeesh Kumar K V]

I think you could add the realized-dispersal-distance of a turtle to a list before it dies. At the end of the run, this list can be combined with the realized-dispersal-distance of all surviving turtles. 

I made a test code to check this (given below) and it seems to work:

globals [dead-turtles-distance]
turtles-own [distance-travelled]


to setup
  ca
  reset-ticks
  
  ;set pcolor of few patches to red
  ask n-of 20 patches
  [
   set pcolor red
  ]
  
  ;initialize list
  set dead-turtles-distance []
    
  ;create 100 turtles and initialize distance-travelled to 0
  create-turtles 100
  [
    set distance-travelled 0
  ]
end

to go
  
  ;specify criteria for stopping a run
  if ticks >= 100
  [
    foreach [distance-travelled] of turtles [x -> set dead-turtles-distance lput x dead-turtles-distance] ;consolidate lists
    stop
  ]
  
  ask turtles
  [
    if random-float 1 < 0.5 
    [
      lt 90 ;turn left
    ]
    fd 1 ;move forward
    set distance-travelled distance-travelled + 1 ;update distance travelled
    
    if pcolor = red 
    [
     set dead-turtles-distance lput distance-travelled dead-turtles-distance ;update the dead-turtles-distance list whenever a turtle dies
     die
    ]
  ]
   tick
end 

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[J]

Thanks Pradeesh! I was thinking a list was probably the way to go. Much appreciated.

Jessica

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Jessica Lockhart