将一列拆分为多个二进制虚拟列 [英] Split a column into multiple binary dummy columns
问题描述
我试图将数据框中的单个字符"变量拆分为多个因子"变量.
I'm trying to split a single "character" variable in my dataframe into mutiple "factor" variables.
> sampledf=data.frame(vin=c('v1','v2','v3'),features=c('f1:f2:f3','f2:f4:f5','f1:f4:f5'))
> sampledf
vin features
1 v1 f1:f2:f3
2 v2 f2:f4:f5
3 v3 f1:f4:f5
> desireddf=data.frame(vin=c('v1','v2','v3'),f1=c(1,0,1),f2=c(1,1,0),f3=c(1,0,0),f4=c(0,1,1),f5=c(0,1,1))
> desireddf
vin f1 f2 f3 f4 f5
1 v1 1 1 1 0 0
2 v2 0 1 0 1 1
3 v3 1 0 0 1 1
我尝试使用 strsplit()
来分隔功能"列
I've tried using strsplit()
to separate the "features" column
strsplit(as.character(df$features), ";")
但没有运气分解它们.
推荐答案
我们可以使用 mtabulate
从 qdapTools
拆分后(strsplit(..
>)功能"列.
We can use mtabulate
from qdapTools
after splitting (strsplit(..
) the 'features' column.
library(qdapTools)
cbind(sampledf[1],mtabulate(strsplit(as.character(sampledf$features), ':')))
# vin f1 f2 f3 f4 f5
#1 v1 1 1 1 0 0
#2 v2 0 1 0 1 1
#3 v3 1 0 0 1 1
或者我们可以使用 library(splitstackshape)
library(splitstackshape)
df1 <- cSplit_e(sampledf, 'features', ':', type= 'character', fill=0, drop=TRUE)
names(df1) <- sub('.*_', '', names(df1))
或者使用base R
方法,我们像以前一样split
,从strsplit中设置
list
元素的名称code> 与 'vin' 列,使用 stack
转换为键/值列 'data.frame',获取 table
,转置和 cbind
'sampledf' 的第一列.
Or using base R
methods, we split
as before, set the names of the list
elements from the strsplit
with 'vin' column, convert to a key/value columns 'data.frame' using stack
, get the table
, transpose and cbind
with the first column of 'sampledf'.
cbind(sampledf[1],
t(table(stack(setNames(strsplit(as.character(sampledf$features), ':'),
sampledf$vin)))))
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