合併可以使用 paste 或是 paste0, 參考以下範例:
mydf <- head(iris[-5])
mydf
# 使用 apply + paste0 合併4欄資料
mydf$all <- apply(mydf, 1, function(x) paste0(x, collapse = ","))
mydf$all
# [1] "5.1,3.5,1.4,0.2" "4.9,3,1.4,0.2" "4.7,3.2,1.3,0.2" "4.6,3.1,1.5,0.2" "5,3.6,1.4,0.2" "5.4,3.9,1.7,0.4"
# end