Why I got warning from the following code? > assign("x", c(10, 5, 4, 2, 2)) > y <- c(x, 0, x) > y [1] 10 5 4 2 2 0 10 5 4 2 2 > v <- 2*x + y + 1 Warning message: longer object length is not a multiple of shorter object length in: 2 * x + y > v [1] 31 16 13 7 7 21 21 14 9 7 23