data(butterflies)
no.of.spp(butterflies)
no.of.ind(butterflies)
jj1 <- count(c(dogs=7,pigs=3,crabs=1,slugs=1))
jj2 <- count(c(squid=0,octopus=0,nautilus=0))
jj3 <- count(c(bugs=3,rats=1,crabs=0,fish=0))
extinct(jj1 + jj2)
extinct(jj3) #cats 'n' fish
extant(jj3) #bugs and rats
singletons(jj1)
singletons(jj2) # empty
singletons(jj1 + jj3) # crabs, rats and slugs
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