R help - Feb 2014 - Controlling plot axis for dates

I?d like to control the number of tick marks on the ?x? axis of a plot, 
when the variable there is dates.  I thought to use the xaxp parameter, 
but the documentation for par says ?It [i.e., xaxp] is only relevant to 
default numeric axis systems, and not for example to dates.?  My 
question, then, is how to control the number of ticks on an axis that 
represents dates?

On 27/02/2014 17:09, David Parkhurst wrote:
> I?d like to control the number of tick marks on the ?x? axis of a plot,
> when the variable there is dates.  I thought to use the xaxp parameter,
> but the documentation for par says ?It [i.e., xaxp] is only relevant to
> default numeric axis systems, and not for example to dates.?  My
> question, then, is how to control the number of ticks on an axis that
> represents dates?
See ?Axis and ?axis.Date .
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
Please do.  It is not clear which plot method it was that produced 
dates, although it is a fair guess that it called Axis().

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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