[R] Hide line ends behind unfilled circles?

[Uwe Ligges]

Michael Kubovy wrote:
> 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?

For example, draw the cirles filled (with white background):

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


Uwe Ligges

 > _____________________________
> Professor Michael Kubovy
> University of Virginia
> Department of Psychology
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> 
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