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margin.table

3 messages · Brian Ripley, Jagat Sheth, Peter Dalgaard

Original
Brian Ripley
#
On Mon, 2 Jul 2001, Jagat Sheth wrote:

            

      
      
      
    

        
Yes.

            

      
      
      
    

        
Try looking up the help page:

Arguments:

       x: an array


A data frame is *not* an array:

            

      
      
      
    

        
[1] FALSE

and final line of margin.table tries to make the result make into a
data frame.

One could argue that as it accepted a non-array it should do a better job
with it, but we need the author (who is away this week) to explain why
he copied the class of the first argument to the result.

  
    

      
      
    

  


  


      

    

    

      


  

        

      Jagat Sheth
    

    

      
      #
    

  


  

      
Hello all, 

I was wondering if the following behaviour of margin.table in R 1.3.0 is normal.

            

      
      
      
    

        
[1] 1 2 3
<0 rows> (or 0-length row.names)

while using 'apply(x,margin,sum)' I get

            

      
      
      
    

        
1 2 3 
1 2 1 

which appears to be normal. Similar behaviour when margin=2.

On the other hand, the following seems to be fine.

            

      
      
      
    

        
1 2 3 
1 2 1

            

      
      
      
    

        
x y z 
1 2 1 

I am using

            

      
      
      
    

        
_              
platform i386-pc-mingw32
arch     x86            
os       Win32          
system   x86, Win32     
status                  
major    1              
minor    3.0            
year     2001           
month    06             
day      22             
language R    
 
I did not notice the above behaviour with R 1.2.3 and have not found anything in the windows-specific changes to R documentation for R 1.3.0 regarding this. Please let me know if I am overlooking something obvious. Any advice would be appreciated. Thanks. 

Jagat 



Department of Psychiatry
Washington University in St. Louis
St. Louis, MO 63108
USA
Tel: 314-286-2253
Fax: 314-286-2265
email: shethj at epi.wustl.edu


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      Peter Dalgaard
    

    

      
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Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:

            

      
      
      
    

        
Because Kurt (who's also away this week) asked him to... It's to
preserve "xtabs" and "table" classes on the result. Data frames never
entered my mind and I don't think you should reasonably expect them to
work.