Re: [Rd] problem with cut.Date/date plotting in ggplot2

From: hadley wickham <h.wickham_at_gmail.com>
Date: Sat, 11 Oct 2008 10:31:35 -0500

Hi Ben,

I think is a bug with cut.Date. I reported a similar bug (with days) a couple of weeks ago but no one responded.

Hadley

On Fri, Oct 10, 2008 at 9:15 PM, Ben Bolker <bolker_at_zoology.ufl.edu> wrote:
>
> I've hit a problem in ggplot2 which I can trace back to cut.Date ,
> which is either a bug or (??) ggplot2 trying to do something it
> shouldn't with cut.Date (although its use of cut.Date seems OK).
>
> Apparently any (?) call of the form
>
> cut(as.Date("2008-07-07"),"weeks")
>
> where the date *begins the week*, gives the error
>
> Error in 1:(1 + max(which(breaks < maxx))) :
> result would be too long a vector
> In addition: Warning message:
> In max(which(breaks < maxx)) :
> no non-missing arguments to max; returning -Inf
>
> In particular, try:
>
> d <- seq.Date(as.Date("2008-07-05"),as.Date("2008-07-08"),by="days")
> weekdays(d)
>
> cut(d[1],"weeks") ## OK
> cut(d[2],"weeks") ## OK
> cut(d[3],"weeks") ## Monday -- breaks
> cut(d[4],"weeks") ## OK
>
> cut(d[1],"weeks",start.on.monday=FALSE) ## OK
> cut(d[2],"weeks",start.on.monday=FALSE) ## Sunday -- breaks
> cut(d[3],"weeks",start.on.monday=FALSE) ## OK
> cut(d[4],"weeks",start.on.monday=FALSE) ## OK
>
> The particular line that fails within cut.Date is
>
> breaks <- breaks[1:(1 + max(which(breaks < maxx)))]
>
> but I haven't figured out enough about what's going on
> to be able to suggest a fix ...
>
> cheers
> Ben Bolker
>
> session info:
>
>> sessionInfo()
> R version 2.7.2 (2008-08-25)
> i486-pc-linux-gnu
>
> locale:
> LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=C;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C
>
> attached base packages:
> [1] splines grid stats graphics grDevices utils datasets
> [8] methods base
>
> other attached packages:
> [1] ggplot2_0.7 MASS_7.2-44 RColorBrewer_1.0-2 proto_0.3-8
>
> [5] reshape_0.8.1 plyr_0.1
>
>
> Here's the context in which I encountered the problem:
>
> library(ggplot2)
> tdat <- data.frame(date=seq.Date(as.Date("2008-07-07"),
> as.Date("2008-10-10"),by="day"),
> x=1:96)
> q2 = qplot(date,x,data=tdat,geom="smooth")
> print(q2+geom_point())
>
> I can track the problem down to a call like
>
> floor_date(as.Date("2008-07-07"),"weeks")
>
> and digging further in, I can narrow it down to
> the issue above.
>
>
>
>

-- 
http://had.co.nz/

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