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R-alpha: apply()

3 messages · Kurt Hornik, Thomas Lumley, Peter Dalgaard

Original
Kurt Hornik
# 
The following is identical in R and S, but still strange ...

R> apply(matrix(1:20, nc = 4), 1, table)
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    1    1    1    1
[2,]    1    1    1    1    1
[3,]    1    1    1    1    1
[4,]    1    1    1    1    1
R> apply(matrix(rep(1, 20), nc = 4), 1, table)
[1] 4 4 4 4 4
R> apply(matrix(c(1:4, 1, 6 : 8), nc = 4), 1, table)
[[1]]
1 3 7 
2 1 1 

[[2]]
2 4 6 8 
1 1 1 1

-k
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Thomas Lumley
#
On Fri, 22 Aug 1997, Kurt Hornik wrote:

            

      
      
      
    

        
Yes it is.  This is the sort of thing I meant when I complained about
drop=F being the default.  

The third example should be documented in the man page, which only
describes what happens "If each call to FUN returns a vector of length n" 
In fact the Blue Book help pages and the current S-PLUS help also
ignore this possibility.


Thomas Lumley
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      Peter Dalgaard
    

    

      
      #
    

  


  

      
Thomas Lumley <thomas@biostat.washington.edu> writes:

            

      
      
      
    

        
The weirdest thing is actually the first case, where tables of the
same length *but different dimnames* are getting pasted together into
a matrix with no dimnames...