[R] Remove all factor levels from an R dataframe

[John]

Thanks Jim. Can we do descending order?

Jim Lemon <drjimlemon using gmail.com> 於 2020年11月10日 週二 下午4:56寫道：

> Hi John,
>
> df1<-sapply(df1,as.character)
>
> Should do what you ask. The error message probably means that you should
> do this:
>
> df1<-df1[order(as.character(df1$year)),]
>
> as "year" is the name of the first column in df1, not a separate object.
>
> Jim
>
> On Tue, Nov 10, 2020 at 6:57 PM John <miaojpm using gmail.com> wrote:
>
>> Hi,
>>
>>    I would like to sort the following simple dataframe by "year"
>> (characters), but the factor structure prevents me from doing so. How can
>> I
>> remove the factor structure? Thanks!
>>
>> > df1
>>   year                  country
>> 4 2007             Asia; survey
>> 5 2010 8 countries in E/SE Asia
>> 6 2015                    Ghana
>> 7
>> 8 2000                      US?
>> > str(df1)
>> 'data.frame': 5 obs. of  2 variables:
>>  $ year   : Factor w/ 9 levels "2017","2016",..: 4 5 3 6 7
>>  $ country: Factor w/ 9 levels "Euro Area\\newline Testing the MP
>> performance of the Euro Area",..: 4 5 6 7 8
>> > df1[order(-year), ]
>> Error in order(-year) : object 'year' not found
>>
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>>
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>

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