[英]mapply and two lists
I'm trying to use mapply to combine two lists (A and B). 我正在尝试使用mapply来组合两个列表(A和B)。 Each element is a dataframe.
每个元素都是一个数据帧。 I'm trying to rbind the dataframes in A to the corresponding dataframes in B. The following returns what I would like in combo1:
我正在尝试将A中的数据帧转换为B中的相应数据帧。以下内容返回我在combo1中的内容:
num = 10
A<-list()
B<-list()
for (j in 1:num){
A[[j]] <- as.data.frame(matrix(seq(1:9),3,3))
B[[j]] <- as.data.frame(matrix(seq(10:18),3,3))
}
combo1<-list()
for (i in 1:num){
combo1[[i]] <-rbind(A[[i]], B[[i]])
}
I'm trying to use mapply to do the same, but I can't get it to work: 我正在尝试使用mapply来做同样的事情,但我无法让它工作:
combo2<-list()
combo2<-mapply("rbind", A, B)
I was hoping someone could please help me 我希望有人可以帮助我
You were very close! 你非常接近!
## Make this a more _minimal_ reproducible example
A <- A[1:2]
B <- B[1:2]
## Override default attempt to reduce results to a vector, matrix, or other array
mapply("rbind", A, B, SIMPLIFY=FALSE)
# [[1]]
# V1 V2 V3
# 1 1 4 7
# 2 2 5 8
# 3 3 6 9
# 4 1 4 7
# 5 2 5 8
# 6 3 6 9
#
# [[2]]
# V1 V2 V3
# 1 1 4 7
# 2 2 5 8
# 3 3 6 9
# 4 1 4 7
# 5 2 5 8
# 6 3 6 9
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