碰巧看到~回覆一下應該比迴圈快很多abb = data.frame(編號 = seq(1,20,1),值 = c(rep(1,5),rep(2,5),rep(3...
ifelse x = data.frame(x = c(60,10,30), n1 = c(50,50,50),...
硬碟掛了? 選我正解
sam989798的鐵人檔案