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## example of using 'incomparables'
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## example of using 'incomparables'
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x <- data.frame(k1 = c(NA,NA,3,4,5), k2 = c(1,NA,NA,4,5), data = 1:5)
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x <- data.frame(k1 = c(NA,NA,3,4,5), k2 = c(1,NA,NA,4,5), data = 1:5)
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y <- data.frame(k1 = c(NA,2,NA,4,5), k2 = c(NA,NA,3,4,5), data = 1:5)
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y <- data.frame(k1 = c(NA,2,NA,4,5), k2 = c(NA,NA,3,4,5), data = 1:5)
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merge(x, y, by = c("k1","k2")) # NA's match
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merge(x, y, by = c("k1","k2")) # NAs match
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merge(x, y, by = "k1") # NA's match, so 6 rows
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merge(x, y, by = "k1") # NAs match, so 6 rows
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merge(x, y, by = "k2", incomparables = NA) # 2 rows
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merge(x, y, by = "k2", incomparables = NA) # 2 rows
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}
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}
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\keyword{array}
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\keyword{array}
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\keyword{manip}
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\keyword{manip}