install.packages("readxl") getwd() setwd("E:/作業4") library(readxl) tianmao<-read_excel('tianmaoTV.xlsx',skip=1)#把第一行跳過，直接從第二行開始讀取 #創建新變量 tianmao['total_sales']<-tianmao$current_price*tianmao$month_sales_count tianmao[c('current_price','month_sales_count','total_sales')]tianmao$zhekou<-tianmao$current_price/tianmao$original_price tianmao$zhekoua<-1:10 ifelse(a%%2==0,'偶數', '奇數')tianmao['price_class']<-ifelse(tianmao$current_price<1000,'低價',ifelse(tianmao$current_price<=2000,"適中",'高價')) tianmao[c('price_class','current_price')]#重命名 names(tianmao) names(tianmao)[1]<-'mingcheng'%in% #判斷符號前的向量的元素是否是在符號后面的向量中，返回邏輯向量，如果在后面向量中，就返回true names(tianmao)%in%"weight" #是true的就說明這個元素在weight里面 names(tianmao)[names(tianmao)%in%"weight"] names(tianmao)[names(tianmao)%in%"weight"]<-'zhongliang' names(tianmao)#提取子集 newdata<-tianmao[,-c(1:3)] names(newdata) names(tianmao)col1<-c('mingcheng','description','current_price') logical<-names(tianmao)%in%col1 newdata1<-tianmao[,!logical] names(newdata1)tianmao[1,] logical1<-tianmao$brand=='Xiaomi/小米' xiaomi<-tianmao[logical1,] xiaomi?subset xiaomi1<-subset(tianmao,brand=='Xiaomi/小米',c("mingcheng","description"))#homework Q1 library(readxl) tianmao_2 <- read_excel("E:/作業4/tianmaoTV.xlsx",skip = 1) View(tianmao_2)#homewotk Q2 logical<-tianmao_2$current_price<1000 tianmao_Q2<-tianmao_2[logical,] View(tianmao_Q2)#homework Q3 tianmao_2$stock_class<-ifelse(tianmao_2$stock==0,'無貨',ifelse(tianmao_2$stock<100,'低庫存','高庫存')) View(tianmao_2)#homework Q4 tianmao_Q4<-tianmao_2[c('stock','stock_class')] tianmao_Q4#homewotk Q5 names(tianmao_2) tianmao_Q5<-tianmao_2[,-c(7,8)] names(tianmao_Q5)

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