David Lloyd wrote:
> I have code like this: -
>
> #-----------------------------------------------------------------------
> ------------------------------------------------------
>
> x=scan()
> 0 0 0 0 0 1 2 3 4
>
> y=scan()
> 1 1 1 2 2 1 3 4 5
>
> plot(x,y)
>
> identify(0,1,3) #Allows me to select manually to identify co-ordinate
> (0,1) as being duplicated 3 times
> identify(0,2,2) #Allows me to select manually to identify co-ordinate
> (0,2) as being duplicated 2 times
> #-----------------------------------------------------------------------
> ------------------------------------------------------
>
> Is there not a way I can automatically display if points are duplicated
> and by how many times?
>
> I thought if I 'jittered' the points ever so slightly I could get an
> idea of how many duplicates there are but with >100 points the graph
> looks very messy.
You might consider using alpha transparency - the more times a point
is duplicated the darker it will be. For example:
df <- data.frame(x=c(0, 0, 0, 0, 0, 1, 2, 3, 4),
y=c(1, 1, 1, 2, 2, 1, 3, 4, 5))
pdf("alphaExample.pdf", version = "1.4", width = 6, height = 6)
with(df, plot(x,y, col=rgb(1,0,0,.3), pch=16))
dev.off()
RSiteSearch("alpha transparency")
> Regards
> DaveL
>
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