・対象の列名がデータフレームの何番目の列なのかを調べる
# id という列名の列は何番目かを調べる
col_num <- which(names(df)=="id")
・列名の一部変更
#2番目の列名のみ変更
names(df)[2] <- "id_new"
・列名全部変更
colnames(df) <- c("aa", "bb", "cc")
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