[R] ifelse behavior

[Peter Dalgaard BSA]

Stephan Holl <sholl at gmx.net> writes:

> At 02 Sep 2002 16:43:11 +0200 Peter Dalgaard BSA wrote:
> 
> Hello Peter
> 
> > Stephan Holl <sholl at gmx.net> writes:
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -> whats that ?!
> 
> > > Can anybody explain this behavior please ?!
> > 
> > What happens if you say 
> > 
> > blah$index.s - 100 
> > 
> > in the two cases?
> 
> 
>  blah$index.s -100
> [1] -1.421085e-14

I.e.: Never trust exact equality with floatingpoint numbers!

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