摘要：library(datasets) head(airquality) #按月分組 s 0) print("positive") else print("negative") } x0) print("positive") else print("negative") } x Na #錯誤處理的思維 input甚麼，如何Call function 所期待的是甚麼，Output? message?... 阅读全文

摘要：本篇內文主引用 https://zhuanlan.zhihu.com/p/21394945 之內容再稍加整理並參照下方有用資源 [rdocumentation] https://www.rdocumentation.org/packages/graphics/versions/3.5.2/topic 阅读全文

摘要：#Generating normal distribution (Pseudo) random number x user time system.time(readlines("http://www.google.com")) #elapsed time < user time hilbert <- function(n){ i <- 1:n 1/outer(i -1, i, "+"... 阅读全文

摘要：Lexical Scoping ：有Java繼承中呼叫子類時先生成父類的概念，呼叫函數後，系統會轉至其定義處，將其 environment 中所具有的東西(有些可能定義在外層)形成 Closure [閉包] Dynamic Scoping ：呼叫處起算，逐漸往上層找 有閉包的lexical scop 阅读全文

摘要：Introduction Introduction For this first programming assignment you will write three functions that are meant to interact with dataset that accompanie 阅读全文

摘要：t.test(x, y = NULL, alternative = c("two.sided", "less","greater"), mu= 0, paired = FALSE, var.equal = FALSE, conf.level = 0.95, ...) 默認:two.sided雙邊檢驗 阅读全文