Re: [R] bug checking

From: Marc Schwartz <MSchwartz_at_mn.rr.com>
Date: Wed 12 Oct 2005 - 14:34:29 EST

Thanks for the code and the clarifications, including the PDF file.

Yes, I can replicate the behavior here (R 2.2.0 on FC4) and I am cc:ing Kurt Hornik, who ported chron to R and is the chron package maintainer.

It appears that the "culprit" is the argument 'col = "red"', which towards the end of plot.times() is used as follows:

...

    else if (x.times)

        axis.times(1, x, simplify = simplify, labels = TRUE,
            adj = adj, col = col, cex = cex, font = font,
            las = las, lab = lab, mgp = mgp, tcl = tcl)
...

Thus, if the 'x' data is of class 'times', the above code is used and the color of the axis line and tick marks are set to "red" as per the 'col' argument to axis(), which axis.times() ultimately calls.

This results in the behavior that you are seeing, where both the plot symbols/lines and the axis are colored the same.

This does sound like a bug and Kurt can comment better on this.

HTH, Marc Schwartz

On Tue, 2005-10-11 at 18:02 -1000, Parlamis Franklin wrote:
> ## Code was long, so I simplified it by creating vectors from scratch
> so it would run as is. Putative "bug" is still evidenced on the x axis
>
> discount.factors.dates <- seq.dates(from="09/30/2005", to="09/30/2035")
> rates<-seq(4.4, 5.2, by=0.0025);
> plot(discount.factors.dates[1:length(rates)], rates,
> pch=18, las=1, bty="n",
> col="red", col.main="red",
> xlab="Date", ylab="Rate",
> ylim=c(min(rates)-(max(rates)-min(rates))/10,max(rates)+(max
> (rates)-min(rates))/10))
>
> ## This is the output:
>
> ## Hopefully you all see the red x axis.
>
> ## I am running R Cocoa GUI 1.1.2 with R 2.1.1 framework on a dual
> proc 2.7 Ghz Power Mac. A Quartz device is opened when 'plot' is
> called. X11User and X11SDK are installed on t he computer, as well
> as xCode 2.1 (in case that's relevant).
>
>
> On Oct 11, 2005, at 4:47 PM, Marc Schwartz wrote:
>
> > On Tue, 2005-10-11 at 16:07 -1000, Parlamis Franklin wrote:
> >
> >> I have observed the following behavior, wondering if it is a bug
> >> before I submit a report.
> >>
> >> I am using the plot function with call: plot(X, Y,
> >> col="red", . . . ) where X is an object that inherits from classes
> >> 'dates' and 'times' (created with the 'dates' function from package
> >> 'chron') and y is a numeric vector. The color red is applied to the
> >> area from the first to the last tick mark on the x axis (even if I
> >> don't set col="red" and only set, say col.main="red").
> >>
> >> If instead of feeding the function X, I feed it unclass(X) or
> >> as.vector(X) the red color is not applied to the area between the
> >> first and last ticks on the x axis.
> >>
> >> Is this a bug, or just a consequence of there not being a plot method
> >> for the class I am trying to feed the function?
> >>
> >> Franklin Parlamis
> >>
> >
> > As per the Posting Guide, it would be immensely helpful in the attempt
> > to help you, if you would provide the exact code you are using and
> > some
> > sample data here, so that we can exactly replicate what you are
> > experiencing.
> >
> > Lacking that, it would be difficult to assist as we can only guess. It
> > does sound like there is an _appropriate_ change in the plot method
> > behavior as a direct consequence of your modifying the class of the
> > argument(s), which is of course how methods are dispatched. Thus, if I
> > were to guess, this is not a bug.
> >
> > I would however, certainly recommend that you submit an example
> > here to
> > confirm the behavior, before you post a bug report, as that would
> > avoid
> > a more energetic response.
> >
> > Marc Schwartz
> >
> >
> >
>



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Wed Oct 12 14:40:01 2005

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