Re: [Rd] logical operator and addition (PR#10665)

2008-01-31 Thread Duncan Murdoch
[EMAIL PROTECTED] wrote:
 Full_Name: Nicolas Simonis
 Version: 2.6.1
 OS: windows
 Submission from: (NULL) (155.52.10.223)


 Very funny bug :

   
 0.60.6
 
 [1] FALSE
   
 0.60.4+0.2
 
 [1] TRUE

   
I don't see a bug here, I see failure to read FAQ 7.31.  The value 0.6 
is less than 0.4+0.2, when the operation is done in floating point 
approximations.  None of those three numbers is exactly representable.

  (0.4+0.2) - 0.6
[1] 1.110223e-16

Duncan Murdoch
 control :

   
 0.70.7
 
 [1] FALSE
   
 0.70.4+0.3
 
 [1] FALSE

 With R 2.6.1 windows. it's not doing it with R 2.3.1 linux...

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[Rd] logical operator and addition (PR#10665)

2008-01-31 Thread nicolas_simonis
Full_Name: Nicolas Simonis
Version: 2.6.1
OS: windows
Submission from: (NULL) (155.52.10.223)


Very funny bug :

 0.60.6
[1] FALSE
 0.60.4+0.2
[1] TRUE

control :

 0.70.7
[1] FALSE
 0.70.4+0.3
[1] FALSE

With R 2.6.1 windows. it's not doing it with R 2.3.1 linux...

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Re: [Rd] logical operator and addition (PR#10665)

2008-01-31 Thread ripley
This seems another instance of FAQ Q7.31

 0.6 - (0.4 + 0.2)
[1] -1.110223e-16


On Wed, 30 Jan 2008, [EMAIL PROTECTED] wrote:

 Full_Name: Nicolas Simonis
 Version: 2.6.1
 OS: windows
 Submission from: (NULL) (155.52.10.223)


 Very funny bug :

(rather a very common FAQ, when asked as a question)

 0.60.6
 [1] FALSE
 0.60.4+0.2
 [1] TRUE

 control :

 0.70.7
 [1] FALSE
 0.70.4+0.3
 [1] FALSE

 With R 2.6.1 windows. it's not doing it with R 2.3.1 linux...

It depends on the compiler and optimization settings: it is doing it on 
2.3.1 Linux for me (and 2.6.2 RC).


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Brian D. Ripley,  [EMAIL PROTECTED]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
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