[R] Strange labels on plot with dates

[Henrik Andersson]

Hmm,
I'm running 2.4.0 under linux


 > sessionInfo()
R version 2.4.0 (2006-10-03)
i686-pc-linux-gnu

locale:
C

attached base packages:
[1] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
[7] "base"    
 >

++++++++++++++++++++++
pdf("strange.pdf")
startdate <- strptime("2002-01-01",format="%Y-%m-%d")
enddate <- strptime("2006-12-31",format="%Y-%m-%d")
##enddate <- strptime("2002-12-31",format="%Y-%m-%d")
dates <- seq(startdate,enddate,by="week")

daynr <- as.numeric(julian(dates,origin=dates[1]))

yvar <- sin(daynr*2*pi/365)

plot(yvar~dates,type='l')
dev.off()

- Henrik

Gabor Grothendieck wrote:
> What version of R are you using?  When I copy and paste that into
> R 2.4.1 on Windows XP I get 2001, 2002, ..., 2007
>
> On 4/3/07, Henrik Andersson <han at dmi.dk> wrote:
>> Hello fellow R people,
>>
>> I don't understand the default behavior of the axis labeling when
>> plotting dates.
>>
>> I would expect something like 2001, 2002 or possibly Jan 01, Jan
>> 02...Jan 06, but instead I only see Jan 01, Jan 01, Jan 01....
>>
>>
>> See the following example
>>
>> startdate <- strptime("2001-01-01",format="%Y-%m-%d")
>> enddate <- strptime("2006-12-31",format="%Y-%m-%d")
>> dates <- seq(startdate,enddate,by="month")
>>
>> daynr <- as.numeric(julian(dates,origin=dates[1]))
>>
>> yvar <- sin(daynr*2*pi/365)
>>
>> plot(yvar~dates,type='l')
>>
>> Cheers, Henrik
>>
>> -- 
>> Henrik Andersson
>>
>> Danish Meteorological Institute
>> Lyngbyvej 100
>> 2100 Copenhagen Ø
>> Denmark
>> Tel: +45 39157215
>> Email: han at dmi.dk
>>
>> ______________________________________________
>> R-help at stat.math.ethz.ch mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide 
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>


-- 
Henrik Andersson

Danish Meteorological Institute
Lyngbyvej 100
2100 Copenhagen Ø
Denmark
Tel: +45 39157215 
Email: han at dmi.dk

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