thank you, they both work!
On Sun, Sep 19, 2021 at 1:12 PM Jim Lemon <drjimle...@gmail.com> wrote:
>
> Hi Luigi,
> Okay, so you mean:
> I want to change all factors in a dataframe to character class, _not_
> remove them.
>
> factor2character<-function(x) if(is.factor(x)) return(as.character(x))
> else return(x)
> df1<-lapply(df,factor2character)
>
> Jim
>
> On Sun, Sep 19, 2021 at 8:03 PM Luigi Marongiu <marongiu.lu...@gmail.com>
> wrote:
> >
> > Thank you Jim, but I obtain:
> > ```
> > > 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
> > > df1<-df[,!unlist(lapply(df,is.factor))]
> > > str(df1)
> > num [1:5] 13 16 22 27 34
> > > df1
> > [1] 13 16 22 27 34
> > ```
> > I was expecting
> > ```
> > str(df)
> > 'data.frame': 5 obs. of 3 variables:
> > $ region : char "A","B","C","D",..: 1 2 3 4 5
> > $ sales : num 13 16 22 27 34
> > $ country: char "a","b","c","d",..: 1 2 3 4 5
> > ```
> >
> > On Sun, Sep 19, 2021 at 11:37 AM Jim Lemon <drjimle...@gmail.com> wrote:
> > >
> > > 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
> > > >
> > > > ______________________________________________
> > > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > > PLEASE do read the posting guide
> > > > http://www.R-project.org/posting-guide.html
> > > > and provide commented, minimal, self-contained, reproducible code.
> >
> >
> >
> > --
> > Best regards,
> > Luigi
--
Best regards,
Luigi
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