[R-SIG-Finance] two zoo questions

Achim Zeileis Achim.Zeileis at wu-wien.ac.at
Fri May 9 12:38:48 CEST 2008

On Fri, 9 May 2008, michal miklovic wrote:

> I have a zoo object with three time series and the corresponding dates. 
> When I plot it, the x-axis contains dates which are not in the object 
> and, naturally, no data points are displayed for these dates. For 
> example, the date "2006-05-20" is not in the object, but it appears in 
> the x-axis of the plot. As a result, I get a plot with 'empty' segments.

I cannot reproduce that problem. For me 2006-05-22 is the first label 
displayed. In any case, 2006-05-20 is within the range of 
time(ShorterSpan) so I wouldn't be too surprised if it would appear. If 
you want fine control over the axis, you can
   plot(ShorterSpan, ..., axes = FALSE)
   axis.Date(1, time(ShorterSpan), ...)
and pass all desired arguments to axis.Date() including "at" and "format".

> My second question concerns the way of displaying the dates on the 
> x-axis. Currently, the dates are displayed as "V 22", which stands for 
> "2006-05-22". I would like them to be displayed as "22 05 2006" or "22 
> May 2006". How can I do this?

Either suppress axes and add them by hand afterwards as outlined above, or
simply set format = "%d %b %Y" in your plot() call.

Both will lead to a couple of warnings but produce the desired result.


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