[R] Lattice strip labels for two factors

[Deepayan Sarkar]

On 9/23/06, Gabor Grothendieck <ggrothendieck at gmail.com> wrote:
> 1. You can write a custom strip function:
>
>         my.strip <- function(which.given, ..., factor.levels) {
>            levs <- if (which.given == 1) factor.levels
>                    else c("faro", "porto", "lisbon", "setubal")
>            strip.default(which.given, ..., factor.levels = levs)
>         }
>
>         xyplot(value ~ year | fact1 * fact2, data = df,
>            strip = my.strip)
>
> 2. however, its probably easier just to change the levels in
> the data frame.  Just do it in a copy if you don't want to
> change the original one:
>
>         df2 <- df
>         levels(df2$fact2) <- c("faro", "porto", "lisbon", "setubal")
>         xyplot(value ~ year | fact1 * fact2, data = df2)
>
> 3. or you can even do it inline in the data statement which
> similarly won't change the original data frame:
>
>         levs <- c("faro", "porto", "lisbon", "setubal")
>         xyplot(value ~ year | fact1 * fact2,
>            data = replace(df, "fact2", structure(df$fact2, levels = levs)))
>         head(df) # unchanged

or even (untested)

xyplot(value ~ year | fact1 * factor(fact2, levels = levels(fact2),
labels = levs),
       data = df)

Deepayan

> On 9/23/06, Rafael Duarte <rduarte at ipimar.pt> wrote:
> > Thank you for your suggestion.
> > This could be a solution that I didn't think of.
> >
> > But I forgot to say that I didn't want to change the original data frame
> > (I have other code that depends on the original df and on the original
> > factor levels).
> > I was looking more for an implementation directly in the xyplot call
> > (same as I did for one factor). Is it possible/simple to do?
> >
> > Thank you,
> > Rafael
> >
> >
> > Gabor Grothendieck wrote:
> >
> > > Try this:
> > >
> > > levels(df$fact2) <- c("faro","porto","lisbon","setubal")
> > > xyplot( value ~ year | fact1*fact2, data=df, type="b")
> > >
> > >
> > > On 9/22/06, Rafael Duarte <rduarte at ipimar.pt> wrote:
> > >
> > >> Dear list,
> > >> My problem is to change the strip text of lattice panels when using two
> > >> factors.
> > >> I have a data frame with two factors:
> > >>
> > >> df <- expand.grid( "fact1"=c("y","b","r"),
> > >> "fact2"=c("far","por","lis","set"), "year"=1991:2000, "value"= NA)
> > >> df[,"value"] <- sample(1:50, 120, replace=TRUE)
> > >>
> > >> I can make simple xyplot and change the text of the factor levels with
> > >> strip.custom:
> > >>
> > >> require("lattice")
> > >> xyplot( value ~ year | fact1, data=df, type="b", subset= fact2=="far",
> > >> strip = strip.custom(bg=gray.colors(1,0.95), factor.levels=c("yellow",
> > >> "black", "red")),
> > >> layout=c(1,3)
> > >> )
> > >>
> > >> But how can I change the text of the factor levels when using both
> > >> factors as in this plot:
> > >> xyplot( value ~ year | fact1*fact2, data=df, type="b")
> > >>
> > >> (fact2 levels text should change to:
> > >> c("faro","porto","lisbon","setubal"))
> > >>
> > >> I read the help for strip.default and the emails archive, tried with
> > >> "which.given" but could not find out how to accomplish this.
> > >>
> > >> Many thanks,
> > >> Rafael Duarte
> > >>
> > >> --
> > >> Rafael Duarte
> > >> Marine Resources Department - DRM
> > >> IPIMAR -  National Research Institute for Agriculture and Fisheries
> > >> Av. Brasília, 1449-006 Lisbon  -  Portugal
> > >> Tel:+351 21 302 7000      Fax:+351 21 301 5948
> > >> e-mail: rduarte at ipimar.pt
> > >>
> > >> ______________________________________________
> > >> R-help at stat.math.ethz.ch 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.
> > >>
> >
> >
> > --
> > Rafael Duarte
> > Marine Resources Department - DRM
> > IPIMAR -  National Research Institute for Agriculture and Fisheries
> > Av. Brasília, 1449-006 Lisbon  -  Portugal
> > Tel:+351 21 302 7000      Fax:+351 21 301 5948
> > e-mail: rduarte at ipimar.pt
> >
> >
>
> ______________________________________________
> R-help at stat.math.ethz.ch 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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