Re: [R] is.weekend() odd behaviour

2004-05-26 Thread Uwe Ligges 
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 
   6832 

date()
[1] Wed May 26 11:18:56 2004

version _  
platform i386-pc-mingw32
arch i386   
os   mingw32
system   i386, mingw32  
status  
major1  
minor9.0
year 2004   
month04 
day  12 
language R  


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RE: [R] is.weekend() odd behaviour

2004-05-26 Thread Matthew Dowle 

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.

-Original Message-
From: Uwe Ligges [mailto:[EMAIL PROTECTED] 
Sent: 26 May 2004 11:55
To: Matthew Dowle
Cc: '[EMAIL PROTECTED]'
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 
6832 
 
date()
 
 [1] Wed May 26 11:18:56 2004
 
 
version _  
 
 platform i386-pc-mingw32
 arch i386   
 os   mingw32
 system   i386, mingw32  
 status  
 major1  
 minor9.0
 year 2004   
 month04 
 day  12 
 language R  
 
 
 
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 [EMAIL PROTECTED] mailing list 
 https://www.stat.math.ethz.ch/mailman/listinfo/r-help
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Re: [R] is.weekend() odd behaviour

2004-05-26 Thread Gabor Grothendieck 
Uwe Ligges ligges at statistik.uni-dortmund.de writes:
 Matthew Dowle wrote:
  
 table(is.weekend(sapply(1:100, function(i){Sys.sleep(0.05);Sys.time()})))
  
  FALSE  TRUE 
 6832 
 
  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!)

Note that converting a POSIXct to chron using as.chron uses
the GMT datetime, not the datetime in your timezone.  So if its the
weekend in the GMT timezone but not in yours it will indicate that
its the weekend.  Similarly if its the weekend in your timezone
but not in the GMT timezone then it will indicate its not in the
weekend.

If you want the result relative to your timezone convert
to chron like this:

   now - Sys.time()
   chron(unclass(as.Date(format(now

or even easier:

chron(unclass(Sys.Date()))

Now apply is.weekend to that.

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