[R] is.weekend() odd behaviour

[Uwe Ligges]

Matthew Dowle wrote:

> Thanks. When is.weekend() is given an object it doesn't know about, could a
> warning or error be added? At the moment, I think you're agreeing, that it
> silently returns a random TRUE/FALSE.

It's not random, it depends on the value of Sys.time(), which also 
includes seconds .....
I agree that a warning or error might be sensible. So I think you are 
about to write a note to the maintainer of package "chron" including 
patches for is.weekend() and friends?

Uwe Ligges





> -----Original Message-----
> From: Uwe Ligges [mailto:ligges at statistik.uni-dortmund.de] 
> Sent: 26 May 2004 11:55
> To: Matthew Dowle
> Cc: 'r-help at stat.math.ethz.ch'
> Subject: Re: [R] is.weekend() odd behaviour
> 
> 
> Matthew Dowle wrote:
> 
> 
>>It seems is.weekend() is unsure ?
> 
> 
> It is completely sure, if an object is given is.weekend() knows about as in:
> 
> table(is.weekend(sapply(1:100, 
> function(i){Sys.sleep(0.05);as.chron(Sys.time())})))
> 
> (note the as.chron() call!)
> 
> Uwe Ligges
> 
> 
> 
> 
>># Start R 1.9.0 with --vanilla on windows xp
>># load package chron
>>
>>
>>
>>>table(is.weekend(sapply(1:100, 
>>>function(i){Sys.sleep(0.05);Sys.time()})))
>>
>>FALSE  TRUE 
>>   68    32 
>>
>>
>>>date()
>>
>>[1] "Wed May 26 11:18:56 2004"
>>
>>
>>
>>>version         _              
>>
>>platform i386-pc-mingw32
>>arch     i386           
>>os       mingw32        
>>system   i386, mingw32  
>>status                  
>>major    1              
>>minor    9.0            
>>year     2004           
>>month    04             
>>day      12             
>>language R              
>>
>>
>>
>>	[[alternative HTML version deleted]]
>>
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