Hi Luigi,
It's easy:
df1<-df[,!unlist(lapply(df,is.factor))]
_except_ when there is only one column left, as in your example. In
that case, you will have to coerce the resulting vector back into a
one column data frame.
Jim
On Sun, Sep 19, 2021 at 6:18 PM Luigi Marongiu <marongiu.lu...@gmail.com> wrote:
>
> Hello,
> I woul dlike to remove factors from all the columns of a dataframe.
> I can do it n a column at the time with
> ```
>
> df <- data.frame(region=factor(c('A', 'B', 'C', 'D', 'E')),
> sales = c(13, 16, 22, 27, 34), country=factor(c('a',
> 'b', 'c', 'd', 'e')))
>
> new_df$region <- droplevels(new_df$region)
> ```
>
> What is the syntax to remove all factors at once (from all columns)?
> For this does not work:
> ```
> > str(df)
> 'data.frame': 5 obs. of 3 variables:
> $ region : Factor w/ 5 levels "A","B","C","D",..: 1 2 3 4 5
> $ sales : num 13 16 22 27 34
> $ country: Factor w/ 5 levels "a","b","c","d",..: 1 2 3 4 5
> > df = droplevels(df)
> > str(df)
> 'data.frame': 5 obs. of 3 variables:
> $ region : Factor w/ 5 levels "A","B","C","D",..: 1 2 3 4 5
> $ sales : num 13 16 22 27 34
> $ country: Factor w/ 5 levels "a","b","c","d",..: 1 2 3 4 5
> ```
> Thank you
>
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