R help - Nov 2009 - recognizing variable-names of cast() (package: reshape)

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Hi David,

The variable names of mma are sp, dentro, variable and value - area is
not a variable in that data frame.

Hadley

On Sun, Nov 22, 2009 at 9:48 PM, David Douterlungne
<daviddouter at hotmail.com> wrote:
>
>
>
> Dear R Users,
>
>
>
>
> Reshape seems to be very useful for data-manipulation, but I am struggling
with
> the function "cast".
>
> My variable-names are not being recognized by cast()
>
>
>
> ? ? ?cca<-a-cast(mma,sp~area,mean)
>
> ? ? ? ? ? ?Error:
> Casting formula contains variables not found in molten data:
"area"
>
>
>
> ? ? ?cca<-a-cast(mma,sp~"area",mean)
>
> ? ? ? ? ? ?Error:
> Casting formula contains variables not found in molten data:
"area"
>
>
>
>
>
> it does works with "..."
>
>
>
> ? ? ?cca<-cast(mma,sp~...,mean)
>
>
>
> I ?tried many things, including
> transforming my names with to.lower.
>
> ? ? ? names(mma)<-tolower(names(mma))
>
>
>
> What am I doing wrong?
>
>
>
>
>
>
>
> Beneath is a more detailed outprints of the simplified scripts &
results (original data.frame has more variables).
>
>
>
>
> str(ma)
> ? ? 'data.frame': ? 102860 obs. of ?3 variables:
> ? ? ?$ sp ? ?: Factor w/ 12 levels
"Abronia","caoba",..: 3 3 3 3 3 3 3 3 3 3 ...
> ? ? ?$ area ?: num ?49786 6924 21083 27451 1984 ...
> ? ? ?$ dentro: Factor w/ 2 levels "dentro","fuera": 1 1
1 1 1 1 1 1 1 1 ...
>
> mma<-melt(ma,id=c("sp","dentro"),na.rm=T)
>
> str(mma)
> ? ? ?'data.frame': ? 102860 obs. of ?4 variables:
> ? ? ? $ sp ? ? ?: Factor w/ 12 levels
"Abronia","caoba",..: 3 3 3 3 3 3 3 3 3 3 ...
> ? ? ? $ dentro ?: Factor w/ 2 levels "dentro","fuera":
1 1 1 1 1 1 1 1 1 1 ...
> ? ? ? $ variable: Factor w/ 1 level "area": 1 1 1 1 1 1 1 1 1 1
...
> ? ? ? $ value ? : num ?49786 6924 21083 27451 1984 ...
>
> cca<-a-cast(mma,sp~"area",mean)
> ? ? ?Error: Casting formula contains variables not found in molten data:
"area"
>
> cca<-cast(mma,sp~...,mean)
> str(cca)
> ? ? ? List of 3
> ? ? ? $ sp ? ? ? ? : Factor w/ 12 levels
"Abronia","caoba",..: 1 2 3 4 5 6 7 8 9 10 ...
> ? ? ? $ dentro_area: num [1:12] 58755 26464 32139 31494 36731 ...
> ? ? ? $ fuera_area : num [1:12] 61836 29872 33819 36396 42831 ...
> ? ? ? - attr(*, "row.names")= int [1:12] 1 2 3 4 5 6 7 8 9 10 ...
> ? ? ? - attr(*, "idvars")= chr "sp"
> ? ? ? - attr(*, "rdimnames")=List of 2
> ? ? ? ..$ :'data.frame': ? ?12 obs. of ?1 variable:
> ? ? ? .. ..$ sp: Factor w/ 12 levels
"Abronia","caoba",..: 1 2 3 4 5 6 7 8 9 10 ...
> ? ? ? ..$ :'data.frame': ? ?2 obs. of ?2 variables:
> ? ? ? .. ..$ dentro ?: Factor w/ 2 levels
"dentro","fuera": 1 2
> ? ? ? .. ..$ variable: Factor w/ 1 level "area": 1 1
>
> David Douterlungne
>
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