[R] Plot.xts - how to change the x-axis labels to show weekly labels.

[Eduardo M. A. M.Mendes]

Hi Joshua

Many thanks.

>library(Hmisc);
> plot.xts(x,major.ticks="weeks",major.format="%b/%d %H:%M:%S");
> minor.tick(nx=7);

The above  commands give me almost what I need. I just need to figure out
how to split the labels in two lines (without using ggplot2)

Cheers

Ed



-----Original Message-----
From: Joshua Ulrich [mailto:josh.m.ulrich at gmail.com] 
Sent: Saturday, July 30, 2011 1:09 PM
To: Eduardo M. A. M.Mendes
Cc: r-help at r-project.org
Subject: Re: [R] Plot.xts - how to change the x-axis labels to show weekly
labels.

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
>
>
>
>
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>
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