[R] dotplot/Dotplot: connecting points within factor level across time

[Gabor Grothendieck]

Try this:

print(p)
trellis.focus("panel", 1, 1)
with(z, panel.segments(x, as.numeric(y), x+d, as.numeric(y)))
trellis.unfocus()

On 9/16/06, Benjamin Tyner <btyner at gmail.com> wrote:
> For each level of the factor in dotplot, I have time points I'd like to
> connect with a line. In the example below, 'x' represents a starting
> time and 'd' a duration, and I wish to connect 'x' to 'x+d'. Ordinarily
> I would use Dotplot from hmisc for this, but I have not been able to
> find a time class that Dotplot will allow. I can get lattice dotplot to
> put the points up, but I've not figured out how to connect them. Any
> suggestions?
>
> require(lattice)
> z<-data.frame(y=factor(letters),
>              x=structure(1:26,class=c("POSIXt","POSIXct"),tzone=""),
>              d=runif(26))
>
> # this puts the points, but does not connect them
> p<-dotplot(y~x+I(x+d),
>           data=z,
>           scales=list(x=list(format="%M:%S"))
>           )
>
> zh<-z
> zh$x<-as.numeric(zh$x)
> require(hmisc)
> # this connects them, but at the expense of the time info
> ph<-Dotplot(y~Cbind(x,x,x+d),
>            data=zh,
>            pch=" ")
>
>
>
> Thanks,
> Ben
>
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