w1 <- createWorld(minPxcor = 0, maxPxcor = 4, minPycor = 0, maxPycor = 4, data = 1:25)
w2 <- createWorld(minPxcor = 0, maxPxcor = 4, minPycor = 0, maxPycor = 4, data = 25:1)
w3 <- stackWorlds(w1, w2)
plot(w3)
# pass named arguments to specify a different name than the object name
w4 <- stackWorlds(layer1 = w1, layer2 = w2)
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