[R] sum(is.na(c(...)) -> negative number; bug or feature?

[Peter Dalgaard BSA]

Barnet Wagman <wagman at enteract.com> writes:

> > sum(is.na(c(1,NA,3)))
> [1] -1
> 
> (This is from R Version 0.64.0, under Redhat Linux 5.2 (compiled from
> scratch
>  using egcs-g77-1.0.3a-14, although I can't imagine that's relevant).
> 
> Is this a bug, or is there something about sum() that I'm missing?

Bug in is.na(), fixed in 0.64.1.

Apparently, POSIX only specifies that isnan() returns nonzero on NaN's
and RH5.2 took that literally...

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
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