仅将 tidyr 单独应用于特定行 [英] Applying tidyr separate only to specific rows
问题描述
我正在尝试使用 tidyr 来分隔数据框中的一列,同时仅将其应用于特定行.虽然 dplyr::filter 完成了这项工作,但它忽略了我的其余数据.是否有一种干净的方法可以将 tidyr 应用于特定行,同时保持其余数据不变?
这是我的问题的一个例子:
#为示例创建 DFdf<-data.frame(var_a=letters[1:5],var_b=c(sample(1:100,5)),text=c("foo_bla","here_do","oh_yes","baa","land"))
给我这个:
<块引用> var_a var_b 文本1 10 foo_bla2 b 58 here_do3 c 34 oh_yes4 天 1 巴5 e 47 土地
#separating 一列:clean_df<-df %>% 分离(文本,进入=c(第一",秒"),sep=_",删除=F)clean_df
<块引用>
var_a var_b 文本第一秒1 a 10 foo_bla foo bla2 b 58 here_do here do3 c 34 oh_yes 哦是的4 d 1 baa baa <NA>5 e 47 陆地土地<NA>
我只想拆分here_do"行.在此先感谢您的任何帮助!
另一种方法:
cols_to_split = c('here_do')clean_df <-df %>%过滤器(文本 %in% cols_to_split)%>%tidyr::separate(text,into=c("first","sec"),sep="_",remove=F)%>%bind_rows(过滤器(df,!text %in% cols_to_split))# var_a var_b 文本第一秒#1 b 7 here_do here do#2 a 26 foo_bla <不适用>#3 c 23 oh_yes <NA><不适用>#4 d 2 baa <NA><不适用>#5 e 67 陆地 <NA><不适用>
如果您需要将其余行保留在第一"列中,您可以使用:
clean_df <-df %>%过滤器(文本 %in% cols_to_split)%>%tidyr::separate(text,into=c("first","sec"),sep="_",remove=F)%>%bind_rows(filter(df, !text %in% cols_to_split)) %>%mutate(first = ifelse(is.na(first), as.character(text), first))# var_a var_b 文本第一秒#1 b 7 here_do here do#2 a 26 foo_bla foo_bla #3 c 23 oh_yes oh_yes <NA>#4 d 2 baa baa <NA>#5 e 67 陆地 <NA>
I'm trying to use tidyr to separate one column in my data frame, while applying it only to specific rows. While dplyr::filter does the job, it omits the rest of my data. Is there a clean way to apply tidyr to specific rows while keeping the rest of the data untouched?
here is an example of my problem:
#creating DF for the example
df<-data.frame(var_a=letters[1:5],
var_b=c(sample(1:100,5)),
text=c("foo_bla","here_do","oh_yes","baa","land"))
gives me this:
var_a var_b text 1 a 10 foo_bla 2 b 58 here_do 3 c 34 oh_yes 4 d 1 baa 5 e 47 land
#separating one col:
clean_df<-df %>% separate(text,into=c("first","sec"),sep="_",remove=F)
clean_df
var_a var_b text first sec 1 a 10 foo_bla foo bla 2 b 58 here_do here do 3 c 34 oh_yes oh yes 4 d 1 baa baa <NA> 5 e 47 land land <NA>
I want to split only the "here_do" row. Thanks in advance for any kind of help!
Another approach:
cols_to_split = c('here_do')
clean_df <-df %>%
filter(text %in% cols_to_split) %>%
tidyr::separate(text,into=c("first","sec"),sep="_",remove=F) %>%
bind_rows(filter(df, !text %in% cols_to_split))
# var_a var_b text first sec
#1 b 7 here_do here do
#2 a 26 foo_bla <NA> <NA>
#3 c 23 oh_yes <NA> <NA>
#4 d 2 baa <NA> <NA>
#5 e 67 land <NA> <NA>
If you need to keep rest of the rows in column 'first', you may use:
clean_df <-df %>%
filter(text %in% cols_to_split) %>%
tidyr::separate(text,into=c("first","sec"),sep="_",remove=F) %>%
bind_rows(filter(df, !text %in% cols_to_split)) %>%
mutate(first = ifelse(is.na(first), as.character(text), first))
# var_a var_b text first sec
#1 b 7 here_do here do
#2 a 26 foo_bla foo_bla <NA>
#3 c 23 oh_yes oh_yes <NA>
#4 d 2 baa baa <NA>
#5 e 67 land land <NA>
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