Hi I am trying to code something in Netlogo..I am using an existing model Chemical Equilibrium and am trying to implement the following:

turtles-own [speed ]

ask turtles [

;; set velocity ( ambient-temperature = 30 )
;; fd velocity
if temp  > 40 [ "speed" increases of turtles  ]  
ifelse temperature < 30 [ speed of turtles decreases]

]

;; to temp

but it does not seem to work

(it temperature is more than 40 the speed of the turtles increases if the temperature is less than 30 the speed of the turtles decreases) temperature is a slider on the model

the same for pressure ask turtles [

;; if pressure > 50 then speed increases of turtles
;; if pressure < 50 then speed decreases of turtles

]

;; to pressure

thanks