问题
I have a df, such that a row looks like:
name datesemployed university
Kate Oct 2015 – Jan 2016 Princeton
What I want to do is repeat the entire row for each year in the range of variable datesemployed.
In this case, there would be two rows --- one for 2015, and one for 2016.
I've attempted to clean the variable first, but even having a tough time on how to do that:
df3<-str_split_fixed(df$datesemployed, "–", 2)
df<-cbind(df3, df)
回答1:
We can use separate_rows from tidyr while specifying the sep as zero or more spaces followed by - and then any spaces
library(dplyr)
library(tidyr)
df %>%
separate_rows(datesemployed, sep="\\s*–\\s*")
# name datesemployed university
#1 Kate Oct 2015 Princeton
#2 Kate Jan 2016 Princeton
data
df <- structure(list(name = "Kate", datesemployed = "Oct 2015 – Jan 2016",
university = "Princeton"), class = "data.frame", row.names = c(NA,
-1L))
来源：https://stackoverflow.com/questions/61192872/how-to-repeat-rows-in-dataframe-based-on-the-range-of-a-time-variable-in-r