crosscheck <- function(x, y) {
library(Hmisc)
result <- list(x.not.y = x[x %nin% y], y.not.x = y[y %nin% x])
names(result) <- c(sprintf("%s.not.%s", deparse(substitute(x)), deparse(substitute(y))),
sprintf("%s.not.%s", deparse(substitute(y)), deparse(substitute(x))))
result
}
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