Thanks, Jim.
It works!
On Wed, May 6, 2009 at 7:26 PM, jim holtman <jholt...@gmail.com> wrote:
> The result of 'tapply' is just a named vector and the names are in
> alphabetical order. If you want them printed in a different order, then you
> have to specify it. Since you have the order in 'mylevels', this will work:
>
> > str(mysummary)
> int [1:3(1d)] 4 3 2
> - attr(*, "dimnames")=List of 1
> ..$ : chr [1:3] "IN0019800021" "IN0020020064" "IN0020020155"
> > mysummary[mylevels]
> IN0020020155 IN0019800021 IN0020020064
> 2 4 3
> >
>
>
> On Wed, May 6, 2009 at 9:45 AM, Chirantan Kundu <chiran...@2pirad.com>wrote:
>
>> Hi,
>>
>> Does tapply change the order when applied on a factor? Below is the code I
>> tried.
>>
>> > mylevels<-c("IN0020020155","IN0019800021","IN0020020064")
>> >
>>
>> mydata<-c("IN0020020155","IN0019800021","IN0020020064","IN0020020155","IN0019800021","IN0019800021","IN0020020064","IN0020020064","IN0019800021")
>> > myfactor<-factor(mydata,levels=mylevels)
>> > myfactor
>> [1] IN0020020155 IN0019800021 IN0020020064 IN0020020155 IN0019800021
>> IN0019800021 IN0020020064 IN0020020064 IN0019800021
>> Levels: IN0020020155 IN0019800021 IN0020020064
>> > summary(myfactor)
>> IN0020020155 IN0019800021 IN0020020064
>> 2 4 3
>>
>> # Everything fine upto this point. The order of levels is maintained as it
>> is.
>>
>> > mysummary<-tapply(myfactor,mydata,length)
>> > mysummary
>> IN0019800021 IN0020020064 IN0020020155
>> 4 3 2
>>
>> # Now the order has changed.
>>
>> Is this the expected behavior? Any idea on how to avoid the change in
>> order?
>>
>> Regards,
>> Chirantan
>>
>> ____________________________________
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>>
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>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>
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