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IP属地：广东
1、计算向量长度：length() 2、求和：sum() sum(..., na.rm = FALSE) 3、计算平均值：mean() mean...
创建向量和矩阵 1、新建向量：c() 2、新建连续有规则向量：seq() seq(from = 1, to = 1, by = ((to - f...
1. strsplit {base} 语法： strsplit(x, split, fixed = FALSE, perl = FALSE, u...
1. paste {base} 语法： paste (..., sep = " ", collapse = NULL)paste0(..., c...