Can dplyr package be used for conditional mutating?
问题 Can the mutate be used when the mutation is conditional (depending on the values of certain column values)? This example helps showing what I mean. structure(list(a = c(1, 3, 4, 6, 3, 2, 5, 1), b = c(1, 3, 4, 2, 6, 7, 2, 6), c = c(6, 3, 6, 5, 3, 6, 5, 3), d = c(6, 2, 4, 5, 3, 7, 2, 6), e = c(1, 2, 4, 5, 6, 7, 6, 3), f = c(2, 3, 4, 2, 2, 7, 5, 2)), .Names = c(\"a\", \"b\", \"c\", \"d\", \"e\", \"f\"), row.names = c(NA, 8L), class = \"data.frame\") a b c d e f 1 1 1 6 6 1 2 2 3 3 3 2 2 3 3 4 4