netlogo - Efficiency clarification: Asking subsets of a general turtle type or asking breeds? -


i'm working large model many agents executing many procedures each day.

is better such:

ask turtles [  if type = "a" [do-a-thing]  if type = "b" [do-b-thing] ]

or alternatively

ask a-turtles [do-a-thing] ask b-turtles [do-b-thing]

i'm looking lower computational load.

here's example tries both of approaches. creates 100,000 turtles , executes test 1,000 times each case. approach 2 seems faster. on machine, approach 1 took 46.3 seconds, , approach 2 took 30.6 seconds. doesn't use ifelse in approach 1. seems logical approach 2 faster, since avoid comparisons.

breed[a-turtles a-turtle] breed[b-turtles b-turtle]  turtles-own [  typ ]  ; setup button callback function setup   clear-all    ; create turtles approach 1   create-turtles 100000   ask turtles [    ifelse (who < 50000) [      set typ "a"    ]    [      set typ "b"    ]   ]   ; time approach 1  let 0  let iter 1000  reset-timer  while [ < iter ]   [     ; approach 1     ask turtles [       if typ = "a" [         dosomething       ]       if typ = "b" [         dosomething       ]     ]     set i + 1   ]   print (word "approach 1 time: " timer " secs")    ; delete turtles, create turtles approach 2   clear-all   clear-turtles   create-a-turtles 50000   create-b-turtles 50000    ; time approach 2   set 0   reset-timer   while [ < iter ]   [     ; approach 2     ask a-turtles [ dosomething ]     ask b-turtles [ dosomething ]     set i + 1   ]   print (word "approach 2 time: " timer " secs")  end  dosomething   let 0   set i + 1   set i - 1 end

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