R语言 list类型数据转换

例如：

> a=list(c('232','34'),c('good','bad'),c(1,5))
> a
[[1]]
[1] "232" "34" 

[[2]]
[1] "good" "bad" 

[[3]]
[1] 1 5
> names(a)=c('d','w','j')
> a
$d
[1] "232" "34" 

$w
[1] "good" "bad" 

$j
[1] 1 5

> 

list数据类型取值用[[ ]]，如：

> a[[1]]
[1] "232" "34" 
> a[1]
$d
[1] "232" "34" 

> 

现将list类型转换成常用的数据类型：
1、unlist

> unlist(a)
    d1     d2     w1     w2     j1     j2 
 "232"   "34" "good"  "bad"    "1"    "5" 
> 

可通过列名取值。

2、do.call
可使用do.call(rbind,x)和do.call(cbind,x)函数转换成矩阵：

> do.call(rbind,a)
  [,1]   [,2] 
d "232"  "34" 
w "good" "bad"
j "1"    "5"  
> do.call(cbind,a)
     d     w      j  
[1,] "232" "good" "1"
[2,] "34"  "bad"  "5"