# [R] two questions re: the use of lattice (Q1 SOLVED, not Q2)

Ranjan Maitra maitra.mbox.ignored at inbox.com
Mon Jul 23 07:34:07 CEST 2012

```On Sun, 22 Jul 2012 22:05:14 -0700 Bert Gunter <gunter.berton at gene.com>
wrote:
> >
> > On Sun, Jul 22, 2012 at 8:26 PM, Ranjan Maitra
> > <maitra.mbox.ignored at inbox.com> wrote:
> >>
> >>> Just reset the levels of z\$sigma (and also redefine sigmaExpr):
> >>>
> >>>    z\$sigma <- factor(z\$sigma,
> >>>                    levels = c(5,10,20,30,50))  # new levels order
> >>>
> >>>    sigmaExprList <- lapply(as.numeric(levels(z\$sigma)),
> >>>                            function(s) bquote(sigma == .(s)))
> >>>    sigmaExpr <- as.expression(sigmaExprList)
> >>>    INUExpr <- paste0("INU = ", c(0,20,40), "%")
> >>>
> >>>    p <- bwplot(Error ~ Method | sigma + INU, data = z,
> >>>           scales = list(rot=90), horiz = FALSE,
> >>>           layout = c(5,3), col = "red")
> >>>
> >>>    useOuterStrips(p,
> >>>       strip = strip.custom(
> >>>            factor.levels = sigmaExpr),
> >>>       strip.left = strip.custom(
> >>>            factor.levels = INUExpr)
> >>>    )
> >>>
> >>
> >> One last question: how do I draw a line h = 0, lty =2 through each plot?
> >
> > ?panel.abline
> >
> > If you don't know how to use this in a panel function, time to start
> > doing your own "homework." Panel functions are central to the trellis
> > paradigm, so an honest effort to learn these details will be worth the
> > effort. A good place to start is the examples in the above help file.
> > There are also numerous online tutorials and websites. Google. Also
> > check Deepyan Sarkar's (lattice's author) web page.
> >

Thanks a lot for your tip! I have always wondered where to get more
help on figuring out about these things so it will be very useful for
me: definitely, it will be helpful for me to figure out how to do what
you suggest in a panel function.

Best wishes,
Ranjan

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