adding levy-flight implementation

This commit is contained in:
mmoriame 2013-07-15 17:01:58 +02:00
parent 527853ff66
commit 2e444d4496

493
Source/levy-fight.nlogo Normal file
View file

@ -0,0 +1,493 @@
turtles-own [t_FlightLength
t_speed
t_mu]
to setup
__clear-all-and-reset-ticks
create-turtles 1
[
setxy random-xcor random-ycor
set t_FlightLength 0
set t_mu 2
set t_speed 1
set size 5
;pd
;set color red
]
end
to go
ask turtles
[
move-levy
]
tick
end
to move-levy
;incrementally move the distance of t_FlightLength
;Turtles-procedure
if (t_FlightLength <= 0) ;a new flight must be chosen
[
rt random 360
set t_FlightLength Levy t_mu
]
ifelse(t_FlightLength < t_speed) ;only necesary if you expect
;t_FlightLength to become smaller than t_speed (not if you use integers
;foreach t_FLightLength and speed as 1
[
fd t_FlightLength
set t_FlightLength 0
]
[
fd t_speed
set t_FlightLength t_FlightLength - t_speed
]
end
to-report Levy[I_mu] ;following Viswanathan et al. Nature 1999
ifelse(I_mu <= 1)
[
report random-float 100000000000 ;in the limit of mu to 1, the levy
;distribution approaches an infinite uniform disitrubition
]
[
ifelse(I_mu >= 3)
[
report abs (random-normal 0 1) ;in the limit of mu to 3, the levy
;distribution approaches a normal distribution
]
[
let a random-float 1
report exp(ln(a) * (1 / (1 - I_mu)))
]
]
end
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