我在 R 中有一个因子列。 我正在尝试删除它，但我不断收到错误消息。 如何删除 R 中的因子列？

Question

My data frame df has has a factor column. The column is just filled with "yes" and "no" values. I used the following formula:

* df$column <- NULL*

However I get the following messages;

Warning message: In Ops.factor(df$Embarked, NULL): '<' not meaningful for factors

&

logical(0)

Can someone advise what formula to use instead of the one I used please?

Answer 1

library(dplyr)
df <- select(df, -column)

Answer 2

It should work.

df <-
    data.frame(fac = factor(sample(
        c("yes", "no"), size = 10, replace = TRUE
    )), ind = 1:10)
df$fac <- NULL
# column is removed

Check if NULL is valid, not being overwritten by something else.