分散多列[tidyr] [英] Spread multiple columns [tidyr]
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问题描述
我想使用 tidyr
将数据分布在多列中。
I would like to spread data over multiple columns using tidyr
.
dat <- data.frame(ID = rep(1,10),
col1 = LETTERS[seq(1,10)],
col2 = c(letters[seq(1,8)],NA,NA),
col3 = c(rep(NA,8),"5",NA),
col4 = c(rep(NA,8),NA,"value"))
预期结果是:
Out <- data.frame(t(c(1,letters[seq(1,8)],"5","value")),row.names=NULL)
colnames(Out) <- c("ID",LETTERS[seq(1,10)])
我想到了:
a <- dat %>% gather(variable, value, -(ID:col1)) %>%
unite(temp, col1, variable) %>%
spread(temp, value)
a[,-which(is.na(a))]
笨拙,还会更改列名。
which is clumsy and also changes the column names. Is there a better solution for this?
推荐答案
我们可以使用 na.rm = TRUE
在收集
中,使用 select
删除变量,并使用 spread
We can use the na.rm=TRUE
in gather
, remove the 'variable' with select
and use spread
library(dplyr)
library(tidyr)
gather(dat, variable, val, -(ID:col1), na.rm=TRUE) %>%
select(-variable) %>%
spread(col1, val)
# ID A B C D E F G H I J
#1 1 d b b c b b b a 5 value
更新
使用 tidyr
( tidyr_0.8.3.9000
)的开发版本,我们可以使用 pivot_wider
当要考虑多个值列时
Update
With the devel version of tidyr
(tidyr_0.8.3.9000
), we can use pivot_wider
when there are multiple value columns to be considered
dat %>%
pivot_wider(names_from = col1, values_from = str_c("col", 2:4)) %>%
select_if(~ any(!is.na(.)))
# A tibble: 1 x 11
# ID col2_A col2_B col2_C col2_D col2_E col2_F col2_G col2_H col3_I col4_J
# <dbl> <fct> <fct> <fct> <fct> <fct> <fct> <fct> <fct> <fct> <fct>
#1 1 a b c d e f g h 5 value
如果我们使用 reshape2
,类似的选择是
library(reshape2)
dcast(melt(dat, measure = 3:5, na.rm=TRUE),
ID~col1, value.var='value')
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