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

From: Ben Bolker <bolker_at_zoology.ufl.edu>
Date: Fri, 10 Oct 2008 22:15:49 -0400

   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


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 ...

    Ben Bolker

session info:

> sessionInfo()

R version 2.7.2 (2008-08-25)


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:

tdat <- data.frame(date=seq.Date(as.Date("2008-07-07"),


q2 = qplot(date,x,data=tdat,geom="smooth") print(q2+geom_point())

  I can track the problem down to a call like


and digging further in, I can narrow it down to the issue above.

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