struct DrunkardsWalkSim <: GoalStateSim
wallLoc::Int
startPos::Int
probLeft::Float64
end
function DrunkardsWalkSim(; walls=10, start=0, prob_left=0.5, prob_right=0.5, measure=:steps)
abs(start) >= walls && error(“Drunkard must start between walls; walls = [-$walls, $walls] and start = $start”)
( prob_left == 0.5 != prob_right ) && (prob_left = 1 – prob_right)
( prob_left != 1 – prob_right && prob_right != 0.5 ) && error(“prob_left != 1 – prob_right; prob_left = $prob_left, prob_right = $prob_right”)
setmeasure(measure)
DrunkardsWalkSim(walls, start, prob_left)
end
const DWSim = DrunkardsWalkSim
probleft(sim::DWSim) = sim.probLeft
probright(sim::DWSim) = 1 – probleft(sim)
walls(sim::DWSim) = sim.wallLoc
start(sim::DWSim) = sim.startPos