Simple lattice question

-----Mensaje original-----
De: Peter Ehlers [mailto:ehlers at ucalgary.ca]
Enviado el: jueves, 31 de marzo de 2011 18:09
Para: Rub?n Roa
CC: r-help at r-project.org
Asunto: Re: [R] Simple lattice question

On 2011-03-31 06:58, Rub?n Roa wrote:

Thanks Peters!

Just a few minor glitches now:

require(lattice)
data<-

data.frame(SP=sort(rep(as.factor(c('A','B','C','D','E')),12)),

                     x=rpois(60,10),
                     y=rep(c(rep(0,4),rep(10,4),rep(20,4)),5),
                     z=rep(1:4,15))

xyplot(x~y|SP,data=data,groups=z,layout=c(2,3),pch=1:4,lty=1:4

,col='black',type='b',

         key=list(x = .65, y = .75, corner = c(0, 0), points=TRUE,
                    lines=TRUE, pch=1:4, lty=1:4, type='b',
                    text=list(lab = as.character(unique(data$z)))))

I have an extra column of symbols on the legend,

and,

would like to add a title to the legend. Such as 'main' for plots.

Any suggestions?

for key(), make 'lines' into a list:

   xyplot(x~y|SP,data=data,groups=z,layout=c(2,3),
          pch=1:4,lty=1:4,col='black',type='b',
          key=list(x = .65, y = .75, corner = c(0, 0),
                   title="title here", cex.title=.9, lines.title=3,
                   lines=list(pch=1:4, lty=1:4, type='b'),
                   text=list(lab = as.character(unique(data$z)))))

Peter Ehlers

... that works. Thanks Peter (sorry I misspelled your name b4). The clean code is now:

require(lattice)
data<- data.frame(SP=sort(rep(as.factor(c('A','B','C','D','E')),12)),
                    x=rpois(60,10),
                    y=rep(c(rep(0,4),rep(10,4),rep(20,4)),5),
                    z=rep(1:4,15))
xyplot(x~y|SP,data=data,groups=z,layout=c(2,3),pch=1:4,lty=1:4,col='black',type='b',
        key=list(x = .65, y = .75, corner = c(0, 0),
                   lines=list(pch=1:4, lty=1:4, type='b'),
                   title=expression(CO^2),
                   text=list(lab = as.character(unique(data$z)))))

David's code works too (thanks to you too!) and is somewhat shorter

xyplot(x~y|SP, data=data,groups=z, layout=c(2,3), par.settings=simpleTheme(pch=1:4,lty=1:4,col='black'), type="b",
        auto.key = list(x = .6, y = .7, lines=TRUE, corner = c(0, 0)))

but the lines and symbols are on different columns, and the line types look as if they were in bold.

Rub?n