[R] How to plot multiple data sets with different colors (also with legend)?

Peng Yu pengyu.ut at gmail.com
Sun Oct 18 22:37:34 CEST 2009

The following commands only show the data in 'y'. I'm wondering how to
show the data in 'x' as well. I also want to add a legend to show that
blue points corresponds to 'x' and yellow points correspond to 'y'.
Could somebody let me know what the correct commands should be?


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