Sorry to bother your.
I am trying to post my question for more than 10 times, but I still
didn't see it.
It drives my crazy!!!
It is a test for posting some simple pure text.
Chao
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https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide
http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.