Thank you Deepayan. Let's do the following exercise to reproduce the problem I'm facing. In the following code, I tried to have plot.rw1 and plot.rw2 shows in two separate rows on my plot windows. However, after the call to the 2nd levelplot, plot of plot.rw2 replace my first plot and the result shows only 1 row on my windows. Any lights on this would be really appreciated. Thank you.x <- seq(0.1,1,0.1);y <- seq(0.1,1,0.1);dat <- rnorm(4*length(x)*length(y));Pa.dat <- expand.grid(x,y);Pa.dat$z <- dat[1:100];Pa.dat$cond <- "Pa";plot.rw1 <- Pa.dat;Pb.dat <- expand.grid(x,y);Pb.dat$z <- dat[101:200];Pb.dat$cond <- "Pb";plot.rw1 <- rbind(plot.rw1, Pb.dat);names(plot.rw1) <- c("x","y","z","cond");Days1.dat <- expand.grid(x,y);Days1.dat$z <- dat[201:300];Days1.dat$cond <- "Day Work";plot.rw2 <- Days1.dat;Days2.dat <- expand.grid(x,y);Days2.dat$z <- dat[301:400];Days2.dat$cond <- "Day Rest";plot.rw2 <- rbind(plot.rw2, Days2.dat);names(plot.rw2) <- c("x","y","z","cond");windows();par(mfrow=c(2,1));levelplot(z ~ x*y|cond, plot.rw1);levelplot(z ~ x*y|cond, plot.rw2);----- Original Message -----From: Deepayan Sarkar Date: Wednesday, June 27, 2007 7:00 pmSubject: Re: [R] levelplot in latticeTo: "adschai@optonline.net" Cc: r-help@stat.math.ethz.ch> On 6/27/07, adschai@optonline.net  wrote:> > Hi,> >> > I'm new to lattice. So please kindly be patient with me.> > I'm trying to arrange groups of levelplots into 3 rows as follows:> >> > Row1: Probabilities as functions of x and y, and conditioned > on an event factor vector factor("a","b","c")> >> > Row2: Number of days as functions of  x and y, and conditioned > on, again the same event factor("a","b","c")> >> > Row2: Costs as functions of  x and y, and conditioned on, > again the same event factor("a","b","c")> >> > I tried the following:> >> > windows();> > par(mfrow=c(3,1));> > levelplot(z ~ x*y|events, probDat);> > levelplot(z ~ x*y|events, daysDat);> > levelplot(z ~ x*y|events, costDat);> >> > It does not do what I want. It replace the previous plot every > time I call a new levelplot. I can't put them into the same > matrix and plot them all at once because the scale of each data > type is very different, i.e.g probability=c(0,1), days=c(0,10), > etc. I'm wondering if you could suggest a way to solve this problem.> >> > It all depends on the details. Please give a small reproducible > example.> > Also, if I would like to put in mathematical notation on the > top strip of the plot instead of using text in my events factor > vector, what can I do?> > Use expressions (see ?plotmath). Again, please give details.> > -Deepayan>

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