• 2022-06-01
    下面哪两个是等价的( )。
    A: matrix(c(2, 4, 6, 8, 10, 12), nrow = 1, ncol = 6)
    B: matrix(c(2, 4, 6, 8, 10, 12), nrow = 6, ncol = 1)
    C: rep(2:12, times = 1)
    D: seq(2, 16, by = 2)