[R] fun.aggregate=mean in reshape

[Henrique Dallazuanna]

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 <webmaster at xen.net> 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
>
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> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O