[R] how to draw an overlaid plot for multiple curves using different symbols for each curve?

Sun sun at cae.wisc.edu
Mon Sep 20 00:02:21 CEST 2004

Hello, Rusers:

I have a question to ask for your help. The data has three columns: a, b and

We need to draw an overlaid plot of curves of "a" versus "b" for different
c. That is, draw many curves in one plot and each curve uses a different

Does R have such functions? I have searched for a while. But seems not. I am
new to R. Your help is highly appreciated.

Many thanks. Looking forward to your response,


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