R help - Jul 2011 - Plot.xts - how to change the x-axis labels to show weekly labels.

Dear R-users

 

I am new to R and struggling not to bother the list with silly questions.

 

I read the documentation on xts and searched for some examples over the
internet on how to use plot.xts.  

 

The xts object is as follows

 

dataxts : An 'xts' object from 2010-06-27 to 2010-08-05 containing:

  Data: num [1:56161, 1:14] 74 74.2 74.2 74.1 73.9 ...

  Indexed by objects of class: [POSIXct,POSIXt] TZ: 

  xts Attributes:  

 NULL

 

The time index goes from 2010-06-27 to 2010-08-05 hourly, that is, there are
56151 time stamps.  If I issue plot.xts(dataxts[,1]) a graphics window comes
out with the following x labels:

 

Jun 27 00:00, Jul 11 21:00, Jul 25 21:00, Aug 05  00:00

 

I could not figure out how to change the number of ticks so that the time
stamps (major ticks) are shown weekly and the minor ticks daily.  Besides, I
wonder whether the labels could be show as follows:

 

Jun 27       Jul 11   Jul 25  Aug 05 (just as example)

00:00         21:00   21:00  00:00

 

Thanks for your help and patience.

 

Cheers

 

Ed

 


	[[alternative HTML version deleted]]

Hi Eduardo,

I'm not too familiar with plot.xts, but this answers 2/3 of your requests.
R> plot(x, major.ticks="weeks", major.format="%b %d")

plot.zoo is quite a bit more flexible and has a lot of examples in
?plot.zoo.  Combining plot.zoo with endpoints should be able to give
you what you want.

Best,
--
Joshua Ulrich ?| ?FOSS Trading: www.fosstrading.com



On Sat, Jul 30, 2011 at 9:10 AM, Eduardo M. A. M.Mendes
<emammendes at gmail.com> wrote:
> Dear R-users
>
>
>
> I am new to R and struggling not to bother the list with silly questions.
>
>
>
> I read the documentation on xts and searched for some examples over the
> internet on how to use plot.xts.
>
>
>
> The xts object is as follows
>
>
>
> dataxts : An 'xts' object from 2010-06-27 to 2010-08-05 containing:
>
> ?Data: num [1:56161, 1:14] 74 74.2 74.2 74.1 73.9 ...
>
> ?Indexed by objects of class: [POSIXct,POSIXt] TZ:
>
> ?xts Attributes:
>
> ?NULL
>
>
>
> The time index goes from 2010-06-27 to 2010-08-05 hourly, that is, there
are
> 56151 time stamps. ?If I issue plot.xts(dataxts[,1]) a graphics window
comes
> out with the following x labels:
>
>
>
> Jun 27 00:00, Jul 11 21:00, Jul 25 21:00, Aug 05 ?00:00
>
>
>
> I could not figure out how to change the number of ticks so that the time
> stamps (major ticks) are shown weekly and the minor ticks daily. ?Besides,
I
> wonder whether the labels could be show as follows:
>
>
>
> Jun 27 ? ? ? Jul 11 ? Jul 25 ?Aug 05 (just as example)
>
> 00:00 ? ? ? ? 21:00 ? 21:00 ?00:00
>
>
>
> Thanks for your help and patience.
>
>
>
> Cheers
>
>
>
> Ed
>
>
>
>
> ? ? ? ?[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org 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.
>