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Select columns by vector of names using dplyr
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| one <- seq(1:10) | |
| two <- rnorm(10) | |
| three <- runif(10, 1, 2) | |
| four <- -10:-1 | |
| df <- data.frame(one, two, three) | |
| df2 <- data.frame(one, two, three, four) | |
| str(df) | |
| names.df <- colnames(df) | |
| names.df.2 <- c("one", "two", "three") | |
| #install.packages("dplyr") | |
| library(dplyr) | |
| select_(df2, names.df) # no - only first variable name | |
| select_(df2, names.df.2) # no - only first variable name | |
| select(df2, one_of(names.df)) # success | |
| select(df2, one_of(names.df.2)) # success |
I've read the vignette plenty of times and still don't understand .dots, but this has helped me immensely.
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From Hadley on twitter:
select_(df2, .dots = names.df)
see: vignette("nse") to understand more about .dots and select_