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S4 object does not commute?

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S4 object does not commute?

McGehee, Robert
Hello all,
It appears that for the simplest of S4 objects, z+1 does not equal 1+z.
Presumably this is a bug, as 1+z seems to make a malformed object (at
least malformed as an input to str).
Thanks, Robert


> setClass("test", representation("vector"))
[1] "test"
> z <- new("test", 1)
> identical(z+1, 1+z)
[1] FALSE
> str(z+1)
Formal class 'test' [package ".GlobalEnv"] with 1 slots
  ..@ .Data: num 2
> str(1+z)
Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
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Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
Class 'test' Class 'test' Class 'test' Class 'test' Class 'test' Class
'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
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'test' Class 'test' Class 'test' Class 'test' Class 'test' Class 'test'
Class 'test' Class 'test' Error: evaluation nested too deeply: infinite
recursion / options(expressions=)?

> R.version
               _                          
platform       x86_64-unknown-linux-gnu    
arch           x86_64                      
os             linux-gnu                  
system         x86_64, linux-gnu          
status                                    
major          2                          
minor          8.0                        
year           2008                        
month          10                          
day            20                          
svn rev        46754                      
language       R                          
version.string R version 2.8.0 (2008-10-20)

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