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Create turtles ONCE at setup and not in every tick

In my program, the turtle breed CO2s has initial concentration of 10, and the turtle breed glucose will start with 10 and increase by 10 each tick (as stated in the setup-feed procedure). The to go procedure includes a turtle breed bacteria that eats CO2s and glucose each tick. The problem is that with my current code both breed of turtles, CO2s and glucose, increase each tick. My current output Excel looks like this:

enter image description here

I hope my output Excel can look like this:

enter image description here

Any comments or suggestions on this issue?

Breed [glucose a-glucose];; Glucose
Breed [CO2s CO2]
Breed [bacteria bacterium]

 glucose-own [glucose_mass] 
 bacteria-own [bacteria_mass]
 CO2s-own [CO2s_mass]

Globals
[
time

Initial_concentration_glucose
Initial_concentration_CO2s
total_glucose
total_CO2s
]

to setup
  clear-all
  set time 0
  set Initial_concentration_glucose 0 
  set Initial_concentration_CO2s 0
  set total_glucose 0
  set total_CO2s 0

;;; BACTERIA;;;
  set-default-shape bacteria "default"
  create-bacteria (20)
  [ set color cyan
   set bacteria_mass 20 / 20
  ]
 ;;; CO2s;;;
  set-default-shape CO2s "circle"
  create-CO2s (10)
  [set color orange
   set CO2s_mass (10 / 10)
    setxy random-xcor random-ycor
   ]

  setup-feed
  output-1
  reset-ticks
end

to setup-feed

  set-default-shape glucose "circle";; Glucose shape
  Create-glucose (10) 
  [
   set glucose_mass 10 / 10
   setxy random-xcor random-ycor
  ]

end

to output-1
if (file-exists? "TestINOUT-AD.csv") [carefully [file-delete "TestINOUT-AD.csv"] [print error-message]]
   file-open "TestINOUT-AD.csv"
      file-type "tick,"
      file-type "Initial_concentration_glucose,"
      file-type "Initial_concentration_CO2s,"
      file-type "Bacteria,"
      file-type "CO2s,"
      file-print "glucose,"
   file-close
end

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;; PROCEDURES ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

to go
   if not any? turtles [stop]

  Calculate_concentrations

  ask bacteria
   [ eat
  ]

  set time time + 1

  count_glucose
  count_CO2s

  output-2

 tick

if (time = 72) [stop]

end

;;;;;;;;;;;;;;;;HELPER PROCEDURES

to Calculate_concentrations
  set Initial_concentration_glucose (Initial_concentration_glucose + sum [glucose_mass] of glucose + 0.0000001)
   set Initial_concentration_CO2s (Initial_concentration_CO2s + sum [CO2s_mass] of CO2s + 0.0000001)
end

to eat
  let prey one-of glucose-here
  if prey != nobody
  [ask prey [die]]

   let prey2 one-of CO2s-here
  if prey2 != nobody
  [ask prey2 [die]]

end


to output-2
  file-open "TestINOUT-AD.csv"
   file-type ticks file-type ","
   file-type Initial_concentration_glucose file-type ","
   file-type Initial_concentration_CO2s file-type ","
  file-type total_CO2s file-type ","
   file-print total_glucose 
  file-close
end

to count_glucose
  set total_glucose (total_glucose + sum [glucose_mass] of glucose)
end

 to count_CO2s
    set total_CO2s (total_CO2s + sum [CO2s_mass] of CO2s )
end
Solution

  • Turtles are not being created, your procedure count_glucose is a cumulative sum of glucose_mass and this is what is being output in your file. But your question suggests that you think this is reporting the number of glucose agents.

    to count_glucose
  set total_glucose (total_glucose + sum [glucose_mass] of glucose)
end

    If you actually want to count the glucose agents, then you want count glucose

    file-print count glucose

    instead of:

    file-print total_glucose