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我有以下兩個數據幀:的R - 添加值以數據幀相匹配的特定標準
d <- data.frame(c1 = c("A","A","B","C","A","C","D","D"))
map <- data.frame(c1 = c("A","B","C","D"), c2 = c(12,14,16,25))
如何添加稱爲「匹配」,以數據幀d另一列包含在數據中發現的相應值幀圖?所以數據幀d應該看起來像:
A 12
A 12
B 14
C 16
A 12
C 16
D 25
D 25
非常感謝提前!