R语言 有关向量、列表、矩阵、数据框的代码示例
# Goals: A first look at R objects - vectors, lists, matrices, data frames.# To make vectors "x" "y" "year" and "names"x <- c(2,3,7,9)y <- c(9,7,3,2)year <- 1990:1993names <- c("payal", &q
