[R] as.ordered

[Friedrich Schuster]

Hello, 

(Warning. This might not be the most complete or elegant solution ...)

If you want a sorted dataframe: look here for example
http://tolstoy.newcastle.edu.au/R/help/05/02/12391.html

To convert the factors from a data frame, you have to call as.ordered for
each factor separately (not for the dataframe).
To convert  two factors a and b and merge them into a new dataframe: 
newFrame <- as.data.frame(cbind(as.ordered(a),as.ordered(b)))
l
For a larger number of factors this can be done with a loop or better one of
the "apply"-functions. 

Hope this helps, 
Friedrich Schuster


Birgit Lemcke wrote:
> 
> Hello Members,
> 
> I try to convert variables in a data.frame (bract.awn) in the class  
> ordered.
> 
> str(bract.awn)
> 'data.frame':	348 obs. of  2 variables:
> $ bracts.length.relative.to.flower...............Min: Factor w/ 4  
> levels "1","2","3","4": 2 3 3 3 3 2 1 4 3 2 ...
> $ bract.awn.relative.to.body.................Max    : Factor w/ 4  
> levels "1","2","3","4": 1 3 2 1 4 1 1 1 1 1
> 
> 
> I tried this:
> 
> bract.awn<-as.ordered(bract.awn)
> 
> Fehler in sort.list(unique.default(x), na.last = TRUE) :
>    'x' must be atomic for 'sort.list'
> Have you called 'sort' on a list?
> 
> What am I doing wrong?
> 
> Thanks a lot in advance.
> 
> Regards
> 
> Birgit
> 
> 
> 
> Birgit Lemcke
> Institut für Systematische Botanik
> Zollikerstrasse 107
> CH-8008 Zürich
> Switzerland
> Ph: +41 (0)44 634 8351
> birgit.lemcke at systbot.uzh.ch
> 
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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