[R] Labeling lines in xyplot

[Deepayan Sarkar]

On Tue, Aug 5, 2008 at 11:15 AM, John Poulsen <jpoulsen at zoo.ufl.edu> wrote:
> Hello,
>
> I apologize in advance as this example seems really elementary.  Below I
> have created a simple scatterplot with lines.  I would like to label each
> line with the name of the village, instead of using a legend.  Can someone
> please let me know how to do it.

Lebeling is a call to panel.text() in the panel function; you need to
figure out where to put the labels and make sure there's space for
them. Here's one way:


vlevs <- sort(unique(Villages))

xyplot(Pop~Year,  groups=Villages, type="b",
       main="Population of logging villages",
       panel = panel.superpose,
       panel.groups = function(x, y, group.number, ...) {
           panel.xyplot(x, y, ...)
           panel.text(x[1], y[1], vlevs[group.number], pos = 2)
       },
       lwd=2, lty=c(1,2,3,4,5,6), col=c(1,8,8,1,8), pch=1:5,
       scales = list(tick.number = 6, tck = c(1, 0),
                   x = list(limits = c(1998.5, 2006.5),
                            at = 2000:2006)))

-Deepayan

>
> Thanks in advance -- John
>
>
> Pop=c(1406,1862,2333,2664,2685,2521,2726,0,0,0,0,214,289,365,900,952,1002,1205,1041,942,1004,
>    616,806,859,991,865,810,399,7200,9136,11389,12634,13114,13417,12670)
> Villages=rep(c("Kabo", "Loundoungou", "Ndoki 1", "Ndoki 2",
> "Pokola"),each=7)
> Year=rep(c(2000,2001,2002,2003,2004,2005,2006),7)
>
> xyplot(Pop~Year, groups=Villages,type="b",
>                 main="Population of logging villages",
>                  xlab=list(expression("Years"),cex=1.2),
>                  ylab=list(expression("Number of people"),cex=1.2),
>                  lwd=2,lty=c(1,2,3,4,5,6),col=c(1,8,8,1,8),pch=1:5,
>                 scales=list(tick.number=6, tck=c(1,0)))
>
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