使用 rbind 连接具有零值的数据帧列表

Question

我有一个要连接的数据帧列表

 data List of 3  ###list of 3 dataframes

 AT1: 'data.frame': 1 obs of 2 varibles
 $neighbor: chr "ATa"
 $node: chr "AT1"

 AT2: 'data.frame': 0 obs of 2 varibles
 $neighbor: chr(0)
 $node: chr(0)

 AT3: 'data.frame': 4 obs of 2 varibles
 $neighbor: chr[1:4] "ATe" "ATf" "ATg" "ATh"
 $node: chr[1:4] "AT3" "AT3" "AT3" "AT3"

当我尝试使用

连接数据帧时

  concatdata<-do.call("rbind",data)

我得到以下内容

dataframe

node  neighbor

AT1       ATa
AT3       ATe
AT3       ATf
AT3       ATg
AT3       ATh

我希望按如下方式包含零值数据框。这是为了进一步的计算。我怎么做？

节点邻居

AT1       ATa
AT2       0 or as NA
AT3       ATe
AT3       ATf
AT3       ATg
AT3       ATh

Answer 1

我们可以创建一个 if/else 条件来创建具有 0 行到 NA

的数据集

do.call(rbind, lapply(data, function(x) 
    if(nrow(x)==0) data.frame(neighbour = NA, node = "AT2") else x))[2:1]

或者另一个选择是加入

library(data.table)
rbindlist(data)[data.frame(node = names(data)), on = "node"]

数据

data <- structure(list(AT1 = structure(list(neighbour = "ATa", 
 node = "AT1"), .Names = c("neighbour", 
 "node"), row.names = c(NA, -1L), class = "data.frame"), AT2 = structure(list(
neigbour = character(0), node = character(0)), .Names = c("neigbour", 
 "node"), row.names = integer(0), class = "data.frame"), AT3 = structure(list(
neighbour = c("ATe", "ATf", "ATg", "ATh"), node = c("AT3", 
"AT3", "AT3", "AT3")), .Names = c("neighbour", "node"), row.names = c(NA, 
-4L), class = "data.frame")), .Names = c("AT1", "AT2", "AT3"))

使用 rbind 连接具有零值的数据帧列表

concatenating a list of dataframes with zero values using rbind

r

rbind

数据