[R] na.omit

[Douglas Bates]

buerkle at hawaii.edu writes:

> Why is it that when a vector contains no NAs, na.omit returns an empty
> vector rather than the object/vector that was passed to it?  
> 
> >na.omit(c(1,2,3,4))          
> numeric(0)

Well, because there is a bug in na.omit.default.  The problem is in the
section of code

        omit <- seq(along = object)[is.na(object)]
        nm <- names(object)
        object <- object[-omit]

If there are no NA's in the object, then omit becomes a length 0
vector and -omit doesn't have the intended effect.

A temporary fix would be to insert
        if (length(omit) == 0) return(object)
after the first line shown above.

We'll incorporate a fix for the next release.  Thanks for reporting
the bug.

> ---------------------------
> platform i686-pc-linux-gnu
> arch     i686             
> os       linux-gnu        
> system   i686, linux-gnu  
> status                    
> major    1                
> minor    1.0              
> year     2000             
> month    June             
> day      15               
> language R
> 
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-- 
Douglas Bates                            bates at stat.wisc.edu
Statistics Department                    608/262-2598
University of Wisconsin - Madison        http://www.stat.wisc.edu/~bates/
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