
How can I add a new method to the generic function "[" or "+"

I want to create a S3 and S4 class that will use the "[" and "+" method in a different way.
How can I overload the generic primitive "[" or "+" so the method dispatch will work correctly for my class?

I saw an example of this in the ggplot2 package where different objects are joined using the "+" primitive.
Still, I could not figure out how to do that. 

Can someone give a small code example to show how that works?

TIA
Mark

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Mark Heckmann
Dipl. Wirt.-Ing. cand. Psych.
Vorstraße 93 B01
28359 Bremen
Blog: www.markheckmann.de
R-Blog: http://ryouready.wordpress.com





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