yeah, my mistake is that i did not make the data "c" into a zoo class.
now the problem solved.
thank you everybody
2009/11/27 Gabor Grothendieck <ggrothendi...@gmail.com>
> We will need a minimal reproducible example (as per last line on every
> message to r-help) to answer as trying it with made up data seems to
> work for me. If c is very long try cutting it down to the smallest
> you can get it to and still produce the error, e.g.
>
> cc <- c[1:10]
> rollapply(cc, ...)
>
> and then post the output of dput(cc)
>
> Here is an example:
>
> > library(zoo)
> > c <- zoo(1:100)
> > rollapply(c, 10, sd, na.pad = TRUE, align = 'right')
> 1 2 3 4 5 6
> NA NA NA NA NA NA
> 7 8 9 10 11 12
> NA NA NA 3.027650 3.027650 3.027650
> 13 14 15 16 17 18
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 19 20 21 22 23 24
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 25 26 27 28 29 30
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 31 32 33 34 35 36
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 37 38 39 40 41 42
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 43 44 45 46 47 48
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 49 50 51 52 53 54
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 55 56 57 58 59 60
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 61 62 63 64 65 66
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 67 68 69 70 71 72
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 73 74 75 76 77 78
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 79 80 81 82 83 84
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 85 86 87 88 89 90
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 91 92 93 94 95 96
> 3.027650 3.027650 3.027650 3.027650 3.027650 3.027650
> 97 98 99 100
> 3.027650 3.027650 3.027650 3.027650
> > R.version.string
> [1] "R version 2.10.0 Patched (2009-11-21 r50532)"
> > packageDescription("zoo")$Version
> [1] "1.6-2"
>
>
> On Fri, Nov 27, 2009 at 2:19 AM, Saji Ren <saji....@gmail.com> wrote:
> > Hello:
> >
> > I want to get a rolling estimation of the stdev of my data.
> > Searching the document, I found the function "rollapply" in the zoo
> package.
> >
> > For example, my series is "c", and i want get a period of 10 days,
> > so i write the command below:
> >
> > roll.sd = rollapply( c, 10, sd, na.pad = TRUE, align = 'right' )
> >
> > but there is an error in it ,and the computing cannot be performed.
> > Can anyone help?
> >
> > PLUS: I also found that there is a function called "rollFun" in package
> > 'fSeries', but there isn't anymore.
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@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.
> >
>
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