[R] plot.POSIXct plot.POSIXlt

[Spencer Graves]

      Your example is not self contained, and I was unable to generate 
an example that produced the warning messages you've mentioned. 

      Have you tried 'options(warn=2)', then running your example?  This 
will turn the warning into an error.  Then you might be able to get 
something from 'traceback'.  I also encourage you to experiment with 
'debug'.  I've discussed how to do this in previous posts.  
'RSiteSearch("debug spencer")' produced 124 hits for me just now.  
Number 7 on that list looked like it might help you:  
"http://finzi.psych.upenn.edu/R/Rhelp02a/archive/79251.html". 

      Hope this helps. 
      Spencer Graves

Patrick Giraudoux wrote:
> Hi,
>
> Just to signal that when I want to plot POSIXct variable on x using 
> format within plot(), I get what I want on the plot but with a number of 
> warnings:
>
>  > plot(y~x,format="%y-%m")
> Warning messages:
> 1: "format" is not a graphical parameter in: plot.window(xlim, ylim, 
> log, asp, ...)
> 2: "format" is not a graphical parameter in: plot.xy(xy, type, pch, lty, 
> col, bg, cex, lwd, ...)
> 3: "format" is not a graphical parameter in: axis(side, at, labels, 
> tick, line, pos, outer, font, lty, lwd, 
> 4: "format" is not a graphical parameter in: box(which = which, lty = 
> lty, ...)
> 5: "format" is not a graphical parameter in: title(main, sub, xlab, 
> ylab, line, outer, ...)
>
> I suppose that format may not be at the right place in plot() or/and not 
> handled by the functions called from there, however the documentation 
> (?plot.POSIXct) seems to allow passing this argument:
>
>  ...: Further arguments to be passed from or to other methods,
>           typically graphical parameters or arguments of
>           'plot.default'.  For the 'plot' methods, also 'format'.
>
> Any comment?
>
> Patrick
>
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