[R] Hide line ends behind unfilled circles?

[Peter Dalgaard]

Michael Kubovy <kubovy at virginia.edu> writes:

> Dear r-helpers,
> 
> xx <- c(0.000, 0.210, 0.714, 0.514, 1.000, 0.190, 0.590, 0.152)
> yy <- c(0.000, 0.265, 0.256, 0.521, 0.538, 0.761, 0.821, 1.000)
> aa <- c(19, 19, 19, 21, 19, 21, 21, 21)
> x0 <- xx[c(1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 5, 6, 6, 7)]
> y0 <- yy[c(1, 1, 2, 2, 2, 3, 3, 4, 4, 4, 5, 6, 6, 7)]
> x1 <- xx[c(2, 3, 3, 4, 6, 4, 5, 5, 6, 7, 7, 7, 8, 8)]
> y1 <- yy[c(2, 3, 3, 4, 6, 4, 5, 5, 6, 7, 7, 7, 8, 8)]
> 
> plot(yy ~ xx, pch = aa, cex = 3)
> segments(x0, y0, x1, y1)
> 
> Can anyone suggest a way of insuring that the lines are hidden behind  
> the unfilled circles?

 plot(yy ~ xx, type = "n")
 segments(x0, y0, x1, y1)
 points(yy ~ xx, pch = aa, cex = 3, bg="white")


-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)                  FAX: (+45) 35327907