Copy turtle variable depending on if statement

Question

I am building a model for a predator prey system and I am incorporating a small basic machine learning internal model in the predator.

Predators have 4 strategies (strat is the variable), at the start of the day they select a strat and at the end of each day they check if they had a successful hunt with that strat.

I have another variable that predators own called best-strat which I want to be copied from the last successful strat

my code is the following

to recall-hunts
  if ticks = 98 [ifelse hunt-today = 1 [set last-hunt "success"] [set last-hunt "failure"]]
end

to evaluate-hunt
  if ticks = 99 [if last-hunt = "success" [set best-strat best-strat = strat]
  if last-hunt != "success" [set strat one-of strategies]
    stop]
end

to strategy
  if ticks = 1 [ifelse best-strat = "NA" [set strat one-of strategies] [set strat strat = best-strat]] 
  stop
end

I want the predator to evaluate if they had a good hunt with a given strat and then select the strat which worked best for them previously, if no best strat then simply pick a random one.

strat is a variable which selects from the strategies list ("strat1" "strat2" "strat3" "strat4")

every thing is working except my code to copy the current strat into best-strat at the end of the day if a hunt was successful. At the moment it sets to "false" so something is breaking i guess.

Answer 1

The problem is here:

[set best-strat best-strat = strat]

The line should be

[set best-strat strat]

To explain the error you are getting, best-strat = strat is a logical expression that yields true or false. Thus set best-strat (best-strat = strat) (parentheses added) will set best-strat to true or false, depending on whether or not best-strat equals strat.