[R] xyplot problem

From: Marc Bernard <bernarduse1_at_yahoo.fr>
Date: Fri 16 Jun 2006 - 01:14:45 EST

Dear all,    

  I have created the following data (that you can run) in order to explain my problem:    

  y <- rep(c(1,2), 8)

  id <- rep(1:8,each=2)
x1 <- rep(c("-a","+a"), each = 8)
x2 <- rep(c("-b","+b"), each = 2, times = 4)
x3 <- rep(c("-c", "+c"), each = 4,2)

df <- data.frame(cbind(id,y,x1,x2,x3))    

  If I do:    

  xyplot(y~ x3|x1*x2,data=df,groups=id,type = "b")    

  then my id's are joined by lines which is what I want. However when I wanted to add an horizontal line for each panel by using "panel.abline" the lines disapears, i.e.    

  xyplot(y~ x3|x1*x2,data=df,groups=id,type = "b",panel=function(x,y) {

  I would be grateful if someone can tell me how can I correct the second statement in order to have horizontal lines for each panel and each id are joined by lines.    

  Thank you,    


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