You can use aggregate:
aggregate(data[,c("ozone", "solar.r", "wind", "temp")],
list(month=data$month), mean)
On 12/02/2008, [Ricardo Rodriguez] Your XEN ICT Team <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> We are facing a problem while introducing ourselves to Reshape package
> use. Melt seems to work fine, but cast fails when we use mean as
> fun.aggregate. As you see here, length and sum work fine, but mean
> throws this same error whatever dataset we use.
>
> > cast(aqm, month ~ variable, length)
> month ozone solar.r wind temp
> 1 5 26 27 31 31
> 2 6 9 30 30 30
> 3 7 26 31 31 31
> 4 8 26 28 31 31
> 5 9 29 30 30 30
> > cast(aqm, month ~ variable, sum)
> month ozone solar.r wind temp
> 1 5 614 4895 360.3 2032
> 2 6 265 5705 308.0 2373
> 3 7 1537 6711 277.2 2601
> 4 8 1559 4812 272.6 2603
> 5 9 912 5023 305.4 2307
> > cast(aqm, month ~ variable, mean)
> Error in get(as.character(FUN), mode = "function", envir = envir) :
> variable "fun" of mode "function" was not found
> >
>
>
> Our environment:
>
> > version
> _
> platform i386-apple-darwin8.10.1
> arch i386
> os darwin8.10.1
> system i386, darwin8.10.1
> status
> major 2
> minor 6.2
> year 2008
> month 02
> day 08
> svn rev 44383
> language R
> version.string R version 2.6.2 (2008-02-08)
>
>
> > installed.packages()
>
> reshape "reshape"
> "/Library/Frameworks/R.framework/Resources/library" "0.8.0"
> NA NA
>
>
> Please, could you help use to work out this issue? Thanks!
>
> --
> Ricardo Rodríguez
> Your XEN ICT Team
>
> ______________________________________________
> 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.
>
--
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O
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