w1 <- createWorld(minPxcor = 0, maxPxcor = 9, minPycor = 0, maxPycor = 9, data = runif(100))
w2 <- createWorld(0, 9, 0, 9, data = runif(100))
w3 <- createWorld(0, 9, 0, 9, data = runif(100) + 2) # add 2 so different range
a1 <- stackWorlds(w1, w2)
a1[[2]]
a1[[2]] <- w3
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