a strange logical bug (PR#162)

[Peter Dalgaard BSA]

ripley@stats.ox.ac.uk writes:

> On RH 5.2
> 
>        The isnan() function returns a non-zero value if value  is
>        "not-a-number" (NaN), and 0 otherwise.
> 
> and that non-zero is not defined!

Uh-oh...

> and isnan is used in Arith.c for ISNAN and that is used in coerce.c
> for do_isna (why?)

is.na(0/0) # Splus compat.

> So ISNAN needs to be redefined on Linux at least.  Using ISNA not ISNAN
> solves this one for me.

But...(see above)

A better fix is 

#define ISNAN(x) (isnan(x)!=0)

Next problem: Messing with Arith.h and make'ing doesn't do anything
(dependency missing, obviously)

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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