[R] How to include NA's of a factor in table?

[Jacques VESLOT]

fcv <- factor(c('a', NA, 'c'), exclude=NULL)
table(fcv, exclude=NULL)
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Jacques VESLOT

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Heinz Tuechler a écrit :
> Dear All,
> 
> Is there a better way to include NA's of a factor in the output of table()
> than using as.character()?
> Admittedly, I do not understand the help page for table concerning the
> exclude argument applied to factors. I tried in different ways, but could
> not get NA to be included in the table, if not using as.character() (see
> example).
> 
> Greetings,
> Heinz
> 
> ## example
> fcv <- factor(c('a', NA, 'c'))
> table(fcv)                # shows a, c
> table(fcv, exclude='a')   # shows c
> table(fcv, exclude="")    # shows a, c
> table(fcv, exclude=NULL)  # shows a, c
> table(as.character(fcv), exclude=NULL) # shows a, c, NA
> 
> platform       i386-pc-mingw32                          
> arch           i386                                     
> os             mingw32                                  
> system         i386, mingw32                            
> status         Patched                                  
> major          2                                        
> minor          3.1                                      
> year           2006                                     
> month          07                                       
> day            01                                       
> svn rev        38471                                    
> language       R                                        
> version.string Version 2.3.1 Patched (2006-07-01 r38471)
> 
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