问题
Here's an example
temp <- mtcars
colnames(temp)[grepl("ge", colnames(temp))] <- "garbage"
Output
mpg cyl disp hp drat wt qsec vs am garbage carb
Mazda RX4 21.0 6 160.0 110 3.90 2.620 16.46 0 1 4 4
Mazda RX4 Wag 21.0 6 160.0 110 3.90 2.875 17.02 0 1 4 4
Datsun 710 22.8 4 108.0 93 3.85 2.320 18.61 1 1 4 1
Hornet 4 Drive 21.4 6 258.0 110 3.08 3.215 19.44 1 0 3 1
Hornet Sportabout 18.7 8 360.0 175 3.15 3.440 17.02 0 0 3 2
Valiant 18.1 6 225.0 105 2.76 3.460 20.22 1 0 3 1
I only know what the column name will start with ("ge") but I'm not sure of the column name exactly
I want a solution that works in a dplyr chain
temp %>%
rename(vars(starts_with("ge")), "garbage")
Error: All arguments must be named
of course doesn't work. Thanks for any help
回答1:
You can use rename_at. If you know that only one column starts with "ge", this will work:
library(dplyr)
mtcars %>%
rename_at(vars(starts_with("ge")), funs(paste0("garbage")))
If you want to rename more than one column, the function in funs() needs to return a vector of names, or do something like gsub() to add something to the existing column names.
来源：https://stackoverflow.com/questions/46289997/rename-column-names-dynamically-in-dplyr-chain