问题描述:

I have three data set.

Set 1:

 A B

23 12

34 81

13 45

11 23

set 2:

 A B

.34 1.1

.5 2.0

.4 1.8

set 3:

 A B

-23 5

-3 0.1

.8 -2.3

-.6 1.4

4 3.2

Now i have to create a data frame as the following type :

 A B Type

23 12 1

34 81 1

.

.

.

11 23 1

.34 1.1 2

.5 2.0 2

.4 1.8 2

-23 5 3

.

.

.

4 3.2 3

My attempt:

 set1 <- data.frame(A=c(23,34,13,11),B=c(12,81,45,23))

set2 <- data.frame(A=c(.34,.5,.4),B=c(1.1,2,1.8))

set3 <- data.frame(A=c(-23,-3,.8,-.6,4),B=c(5,.1,-2.3,1.4,3.2))

dat123 <- rbind(set1,set2,set3)

but i couldn't able to add the column Type .

网友答案:

Like this:

l <- list(set1, set2, set3)
do.call(rbind, Map(data.frame, l, type = seq_along(l)))
网友答案:
set1 <- data.frame(A=c(23,34,13,11),B=c(12,81,45,23)) 
set2 <- data.frame(A=c(.34,.5,.4),B=c(1.1,2,1.8))
set3 <- data.frame(A=c(-23,-3,.8,-.6,4),B=c(5,.1,-2.3,1.4,3.2))

Type=rep(c(1,2,3), times=c(nrow(set1), nrow(set2), nrow(set3)))
dat123 <- cbind(rbind(set1,set2,set3), Type)
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