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ifelse behavior

5 messages · Stephan Holl, Peter Dalgaard

Original
Stephan Holl
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Dear R-Users,

I cannot understand the behavior of ifelse.
I have a vector 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
num 100
everything seems OK.
when I do a ifelse-check, something strange happens:
[1] 2

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

Can anybody explain this behavior please ?!

thank you
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Stephan Holl
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Peter Dalgaard
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Stephan Holl <sholl at gmx.net> writes:
What happens if you say 

blah$index.s - 100 

in the two cases?
Stephan Holl
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At 02 Sep 2002 16:43:11 +0200 Peter Dalgaard BSA wrote:
Hello Peter
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ -> whats that ?!
blah$index.s -100
[1] -1.421085e-14

cheers 
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Stephan Holl
GnuPG Key-ID: 11946A09
ICQ# 117277975 
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Peter Dalgaard
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Stephan Holl <sholl at gmx.net> writes:
I.e.: Never trust exact equality with floatingpoint numbers!
Stephan Holl
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At 02 Sep 2002 17:00:02 +0200 Peter Dalgaard BSA wrote:
Hello Peter
I could solve the problem when I used the round() function. Then the
wanted result came out.

anyway,
thanks for your help

cheers
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Stephan Holl
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ICQ# 117277975 
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