[R] is.weekend() odd behaviour
Uwe Ligges
ligges at statistik.uni-dortmund.de
Wed May 26 14:20:00 CEST 2004
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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