R help - Jun 2008 - Subset in cast: compact form?

Hi!

How can I subset several variables in cast?

For example, I can do it for one, (ie, ph):
cast(am, organismo +arriba ~
variable,subset=variable=="ph",mean,na.rm=T)

For selecting ph, temperature and Ba I'm using:
cast(am, organismo +arriba ~ variable,subset=variable=="ph" 
variable=="temperature"| variable== "Ba",mean,na.rm=T)

Is there a more compact form? something like select=c(ph, temperature, Ba)

Thanks

Dr. Agustin Lobo
Institut de Ciencies de la Terra "Jaume Almera" (CSIC)
LLuis Sole Sabaris s/n
08028 Barcelona
Spain
Tel. 34 934095410
Fax. 34 934110012
email: Agustin.Lobo at ija.csic.es
http://www.ija.csic.es/gt/obster

On Thu, Jun 12, 2008 at 2:27 PM, Agustin Lobo <aloboaleu at gmail.com>
wrote:
> Hi!
>
> How can I subset several variables in cast?
>
> For example, I can do it for one, (ie, ph):
> cast(am, organismo +arriba ~
variable,subset=variable=="ph",mean,na.rm=T)
>
> For selecting ph, temperature and Ba I'm using:
> cast(am, organismo +arriba ~ variable,subset=variable=="ph"
> variable=="temperature"| variable== "Ba",mean,na.rm=T)
Probably the most compact way is:

cast(am, organismo +arriba ~ variable ,
 subset =variable %in% c("ph", "temperature","Ba")
,
 mean, na.rm=T
)

(that's an R thing, not particular to reshape)

Hadley


-- 
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