根据前面的问题,我提取了以下数据。帧
DF <- data.frame(A =c("One","Two","Three","Four","Five"),
B=c(1,1,2,2,3),
D=c(10,2,3,-5,5))
subset(DF, B %in% c(1,3))
A B D
1 One 1 10
2 Two 1 2
5 Five 3 5
但现在我想(例如(将数字乘以(比如(5,并将其替换为原始数据帧
以下代码
subset(DF, B %in% c(1,3))[,2:3] * 5
B D
1 5 50
2 5 10
5 15 25
给了我想要的号码,但我如何将它们返回
A B D
1 One 5 50
2 Two 5 10
3 Three 2 3
4 Four 2 -5
5 Five 15 25
答案就在我眼前(索引数字……但我该如何找到它们(?
您可以进行
DF[DF$B %in% c(1, 3), 2:3] <- DF[DF$B %in% c(1, 3), 2:3] * 5
DF
# A B D
#1 One 5 50
#2 Two 5 10
#3 Three 2 3
#4 Four 2 -5
#5 Five 15 25