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

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Tue, 08 Jul 2008 15:17:41 -0400

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



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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 and provide commented, minimal, self-contained, reproducible code. Received on Tue 08 Jul 2008 - 19:45:45 GMT

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