How to generate longitudinal data using R

How to generate the longitudinal data with correlation structure of
independent , exchangeable and AR (1) through errors? Can someone provide
some sample codes?

See

 	http://cran.r-project.org/web/views/Distributions.html

Great appreciation!

Thanks much,
Yi

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Charles C. Berry                            (858) 534-2098
                                             Dept of Family/Preventive Medicine
E mailto:cberry at tajo.ucsd.edu	            UC San Diego
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