R語言中merge函數詳解
1、創建測試數據：
name <- c('A','B','A','A','C','D')
school <- c('s1','s2','s1','s1','s1','s3')
class <- c(10, 5, 4, 11, 1, 8)
English <- c(85, 50, 90 ,90, 12, 96)
w <- data.frame(name, school, class, English)
w
name <- c('A','B','C','F')
school <- c('s3','s2','s1','s2')
class <- c(5, 5, 1,3)
maths <- c(80,89,55,90)
English <- c(88, 89, 32, 89)
q <- data.frame(name, school, class, maths, English)
q
2、查看兩個數據框
w
q
3、指定匹配列進行合並（按照行合並）
merge(w,q,by.x = ‘name’, by.y = ‘name’)
w
q
merge(w,q,by.x = ‘school’, by.y = ‘school’)
4、指定匹配列合並，沒有的內容填充為NA
w
q
merge(w, q, all=TRUE, sort=TRUE)
5、依照左側數據進行匹配
w
q
merge(w ,q ,all.x=TRUE,sort=TRUE)
w
q
merge(w, q, by = ‘name’,all.x = TRUE, sort = TRUE)
6、依照右側數據進行匹配
w
q
merge(w ,q ,by = ‘name’, all.y=TRUE,sort=TRUE)
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