从数据框中提取特定列

Question

I have an R data frame with 6 columns, and I want to create a new dataframe that only has three of the columns.

Assuming my data frame is df, and I want to extract columns A, B, and E, this is the only command I can figure out:

 data.frame(df$A,df$B,df$E)

Is there a more compact way of doing this?

转载于:https://stackoverflow.com/questions/10085806/extracting-specific-columns-from-a-data-frame

Answer 1

Using the dplyr package, if your data.frame is called df1:

library(dplyr)

df1 %>%
  select(A, B, E)

This can also be written without the %>% pipe as:

select(df1, A, B, E)