3
上の行:結果で私は、既存の列に基づいて新しい列を作成したいのですが、</p> <p>上記の行で始まる既存の列に新しい列ベースを作成しますが、
df <- data.frame(a=c(1:10), b=c("red", "yellow", "blue", "green", "yellow", "purple", "blue", "green", "yellow", "purple"))
以下のように見える:
df <- data.frame(a=c(1:10), b=c("red", "yellow", "blue", "green", "yellow", "purple", "blue", "green", "yellow", "purple"), c=c("na", "red", "yellow", "blue", "green", "yellow", "purple", "blue", "green", "yellow"))
あなたはと