[R] lattice panle.segment()

From: Qian R <qianrstudy_at_yahoo.com>
Date: Mon, 28 Apr 2008 16:55:03 -0700 (PDT)

I am try to create a plot using xyplot(). I created a function panel.fun() wich generate segment, but I need use two columns from dataset2.    

  panel.fun <- function(x, y, minx, maxx, miny, maxy) {

# since I don't know how to call dataset2 inside panel.fun(), so I hardcoded the data into function
  seq1 <-c(......)
  seq2 <-c(......)

    for(i in 1:length(seq1))
  a <- seq1[i]
  b <- seq2[i]
  panel.segments(a,miny-rangey,a, maxy+rangey, col= plotcols[i],lty=4, lwd=2)   panel.segments(b,miny-rangey,b, maxy+rangey, col= plotcols[i],lty=4, lwd=2)     }

# after create panel.fun, I call xyplot()
  xyplot(a ~ b , data=dataset1, auto.key=TRUE, panel=function(x,y, minx, maxx, miny, maxy, seq){  panel.fun(x,y, min(na.omit(x)), max(na.omit(x)),min(na.omit(y)),max(na.omit(y)))   })        

  Does anyone know how to solve this probelm?                

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