[R] Problem with date x-axis

[Uwe Ligges]

PtitBleu wrote:
> Hello,
> 
> I have a "friday" problem.
> I'm trying to plot the number of measures by day with this command between
> the 2008-07-31 and the 2009-11-13 (it works) :
> plot(unique(as.Date(strptime(data$date, format="%Y-%m-%d %H:%M:%S))),
> measuresbyday)
> then I would like to plot vertical lines for each month. 
> But it doesn't work because
> par()$usr gives
> 14071.16  14579.84  -7.16  213.16
> and
> as.numeric(as.POSIXct(unique(as.Date(strptime(data$date, format="%Y-%m-%d
> %H:%M:%S)))[1])) corresponding to "2008-08-01" gives
> 1217376000
> 
> I think the last value is ok but I don't understand why the par()$usr values
> are so low.
> 
> Any idea ?



Seems to be unanswered so far - not a big surprise given we do not see a 
small reproducible example (we do neither have measuresbyday nor data) 
that would be easy and quick to adapt to your needs.

Best wishes,
Uwe Ligges


> Thanks in advance and have a nice week-end,
> Ptit Bleu.
> 
> 
> 
> 
>