I have a dataset like this:
a1 <- c("a","a","a", "b", "c", "c", "d", "d", "d", "d")
b1 <- c(7, 7, 7,5, 4, 4, 3, 3, 3, 3)
c1 <- c("A","B", "C", "D", "E", "F", "B", "C", "EE", "F")
m1 <- data.frame(a1, b1, c1)
my expected result is a dataset like this:
a <- c("a","b", "c", "d")
b <- c(7, 5, 4, 3)
c <- c("ABc","D", "EF", "BCEEF")
m <- data.frame(a, b, c)
I try this code but it doesn't work: …