[R] making zoo objects with zoo without format argument?

[Gabor Grothendieck]

Its a bug in axis.zoo.  I have just fixed it in the svn repository so try this:

source("http://r-forge.r-project.org/plugins/scmsvn/viewcvs.php/*checkout*/pkg/R/yearmon.R?rev=485&root=zoo")
plot(x.zoo[, 25])

axis.zoo uses the same algorithm as axis.Date in R and so it gives
similar results:

# uses axis.Date
plot(aggregate(x.zoo[, 25], as.Date, force))

You may wish to try a custom axis:

plot(x.zoo[, 25], xaxt = "n")
rng <- range(time(x.zoo))
axis(1, at = seq(rng[1], rng[2], 1/12), labels = FALSE, tcl = -0.3)
axis(1, at = seq(floor(rng[1]), floor(rng[2])))



On Tue, Jul 8, 2008 at 3:34 PM, stephen sefick <ssefick at gmail.com> wrote:
> That worked fine- now one more question-
> plot(x.zoo[,25])
> produces a graph with True as the first label on the x-axis
> 1. why?
> 2. is it wrong to assume this is february 2006?
>
> thanks
>
> stephen
> R2.7.1 Windows XP (I updated zoo last week when I installed 2.7.1)
>
> On Tue, Jul 8, 2008 at 3:17 PM, Gabor Grothendieck <ggrothendieck at gmail.com>
> wrote:
>>
>> On Tue, Jul 8, 2008 at 2:59 PM, stephen sefick <ssefick at gmail.com> wrote:
>> > x.zoo <- zoo(x,as.yearmon(as.character(x$Yearmonth), "%Y-%m"))
>> > plot(x.zoo[,25])
>>
>>
>> 1. You are trying to pass data frame to zoo whereas it must be a numeric
>> vector,
>> matrix or a factor.  See ?zoo and try this:
>>
>> x.zoo <- zoo(data.matrix(x), as.yearmon(x$Yearmonth, format = "%Y-%m"))
>>
>> 2. You don't need as.character (it won't hurt but its unnecessary) since
>> as.yearmon has a factor method.   You only need as.character in the
>> situation cited in the last post.
>>
>>
>> >
>> > #Error in plot.window(...) : invalid 'ylim' value
>> > #there are values
>> >
>> > On Tue, Jul 8, 2008 at 2:55 PM, Gabor Grothendieck
>> > <ggrothendieck at gmail.com>
>> > wrote:
>> >>
>> >> On Tue, Jul 8, 2008 at 2:43 PM, Gabor Grothendieck
>> >> <ggrothendieck at gmail.com> wrote:
>> >> > There is no data in your data frame, just index info, so I assume you
>> >> > want a zero width time series:
>> >> >
>> >> > zoo(, as.yearmon(x$Yearmonth, "%Y-%m"))
>> >> >
>> >> > This also works but then you are left with a character date which you
>> >> > may not want:
>> >> >
>> >> > zoo(, x$Yearmonth)
>> >>
>> >> This last one should have been:
>> >>
>> >> zoo(, as.character(x$Yearmon))
>> >>
>> >> since your data frame holds a factor rather than character column.
>> >>
>> >>
>> >> >
>> >> >
>> >> > On Tue, Jul 8, 2008 at 1:43 PM, stephen sefick <ssefick at gmail.com>
>> >> > wrote:
>> >> >> #this is a subset of a larger data frame and I am okay with
>> >> >> subsetting
>> >> >> it as
>> >> >> there are redundant time stamps, but I would like to create a zoo
>> >> >> object out
>> >> >> of this and I am having a hard #time figuring out how to do this
>> >> >>  the
>> >> >> date
>> >> >> structure is  year and then month
>> >> >>
>> >> >> x <- structure(list(Yearmonth = structure(c(12L, 24L, 1L, 13L, 14L,
>> >> >> 3L, 15L, 4L, 16L, 5L, 17L, 6L, 18L, 7L, 19L, 8L, 20L, 9L, 21L,
>> >> >> 10L, 22L, 11L, 23L), .Label = c("2006-02", "2006-03", "2006-04",
>> >> >> "2006-05", "2006-06", "2006-07", "2006-08", "2006-09", "2006-10",
>> >> >> "2006-11", "2006-12", "2007-01", "2007-02", "2007-03", "2007-04",
>> >> >> "2007-05", "2007-06", "2007-07", "2007-08", "2007-09", "2007-10",
>> >> >> "2007-11", "2007-12", "2008-01"), class = "factor"), Month = c(1L,
>> >> >> 1L, 2L, 2L, 3L, 4L, 4L, 5L, 5L, 6L, 6L, 7L, 7L, 8L, 8L, 9L, 9L,
>> >> >> 10L, 10L, 11L, 11L, 12L, 12L)), .Names = c("Yearmonth", "Month"
>> >> >> ), class = "data.frame", row.names = c(NA, 23L))
>> >> >>
>> >> >> #thanks Stephen
>> >> >>
>> >> >> --
>> >> >> Let's not spend our time and resources thinking about things that
>> >> >> are
>> >> >> so
>> >> >> little or so large that all they really do for us is puff us up and
>> >> >> make us
>> >> >> feel like gods. We are mammals, and have not exhausted the annoying
>> >> >> little
>> >> >> problems of being mammals.
>> >> >>
>> >> >> -K. Mullis
>> >> >>
>> >> >>        [[alternative HTML version deleted]]
>> >> >>
>> >> >> ______________________________________________
>> >> >> R-help at r-project.org mailing list
>> >> >> https://stat.ethz.ch/mailman/listinfo/r-help
>> >> >> PLEASE do read the posting guide
>> >> >> http://www.R-project.org/posting-guide.html
>> >> >> and provide commented, minimal, self-contained, reproducible code.
>> >> >>
>> >> >
>> >
>> >
>> >
>> > --
>> > Let's not spend our time and resources thinking about things that are so
>> > little or so large that all they really do for us is puff us up and make
>> > us
>> > feel like gods. We are mammals, and have not exhausted the annoying
>> > little
>> > problems of being mammals.
>> >
>> > -K. Mullis
>
>
>
> --
> Let's not spend our time and resources thinking about things that are so
> little or so large that all they really do for us is puff us up and make us
> feel like gods. We are mammals, and have not exhausted the annoying little
> problems of being mammals.
>
> -K. Mullis