plot(subset(cells, x > 0.5))
subset(amacrine, marks == "on")
subset(redwood, nndist(redwood) > 0.04)
subset(finpines, select=height)
subset(finpines, diameter > 2, height)
subset(nbfires, year==1999 & ign.src == "campfire",
select=cause:fnl.size)
v <- subset(chicago, x + y > 1100 & marks == "assault")
a <- subset(rpoispp3(40), z > 0.5)
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