Question
foo bar
1 1 TRUE
2 2 TRUE
3 3 FALSE
4 4 FALSEa.
> x <- data.frame(foo = 1:4, bar = c(F, T, F, F))
> x
b.
> x <- data.frame(foo = 1:6, bar = c(F, T, F, F))
> x
c.
> x <- data.frame(foo = 1:4, bar = c(T, T, F, F))
> x
d.
> x <- data.frame(foo = 14:1, bar = c(F, T, F, F))
> x
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> x
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