Something like this will work:
foo.df <- data.frame(x = 1:8, y1 = c(1,3,5, NA, NA, NA, NA, NA),
y2 = c(NA, NA, NA, 7, 9, 11, NA, NA),
y3 = c(NA, NA, NA, NA, NA, NA, 13, 15))
plot(foo.df$x, foo.df$y1, ylim = c(0,20), type = "n")
points(foo.df$x, foo.df$y1, pch = 1)
points(foo.df$x, foo.df$y2, pch = 2)
points(foo.df$x, foo.df$y3, pch = 3)
HTH, Andy
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] Behalf Of
> [EMAIL PROTECTED]
> Sent: Thursday, December 09, 2004 11:41 AM
> To: [EMAIL PROTECTED]
> Subject: [R] Scatterplot question
>
>
> Dear list members,
> I have a probably simple question concerning scatterplots: I want to
> draw a plot with one X but several Y columns, so that every group
> of samples gets a different symbol. My table looks like this:
>
> X Y1 Y2 Y3
> 1 1
> 2 3
> 3 5
> 4 7
> 5 9
> 6 11
> 7 13
> 8 15
>
> Simple in Excel or StarOffice, but how do I do it in R?
>
> Thanks a lot
>
> Judith
>
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