[R] ifelse behavior

[Stephan Holl]

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Dear R-Users,

I cannot understand the behavior of ifelse.
I have a vector blah
> str(blah)
List of 14
 $ index.s   : num 100
 $ index.u   : num 100
 $ index.t   : num 100
 $ yabstand.s: num NA
 $ yabstand.u: num NA
 $ modal.s   : int 8
 $ modal.u   : int 71
 $ modal.t   : int 21
> 
> str(blah$index.s)
 num 100
> 
everything seems OK.
when I do a ifelse-check, something strange happens:
> ifelse(blah$index.s == 100 ,1,2)
[1] 2

When I replace the blah$index.s with 100 like the following line does
> blah$index.s <-  100
> str(blah$index.s)        
 num 100
it is a numeric value as well, but the result of the ifelse-check is
different!!
> ifelse(blah$index.s == 100 ,1,2)
[1] 1
that's the result which is correct!

Can anybody explain this behavior please ?!

thank you
- -- 
- --------------------------------------
Stephan Holl
GnuPG Key-ID: 11946A09
ICQ# 117277975 
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