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  • R语言中merge函数

    来源:https://blog.csdn.net/u010652755/article/details/72982227/

    1、创建测试数据:

    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、查看两个数据框

    w
    q

    3、指定匹配列进行合并(按照行合并)

    merge(w,q,by.x = 'name', by.y = 'name')

    w
    q
    merge(w,q,by.x = 'school', by.y = 'school')

    4、指定匹配列合并,没有的内容填充为NA

    w
    q
    merge(w, q, all=TRUE, sort=TRUE) 

    5、依照左侧数据进行匹配

    w
    q
    merge(w ,q ,all.x=TRUE,sort=TRUE)

    w
    q
    merge(w, q, by = 'name',all.x = TRUE, sort = TRUE)

    6、依照右侧数据进行匹配

    w
    q
    merge(w ,q ,by = 'name', all.y=TRUE,sort=TRUE) 

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  • 原文地址:https://www.cnblogs.com/liujiaxin2018/p/15468871.html
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