Hi, All;

I simply upgraded my R from version 2.5.0 to 2.5.1 and the whole  
problems disappeared.
So I am closing the question myself. It could have been the R version  
problem.

Tae-Hoon Chung

Post-Doctoral Researcher
Computational Biology Division, TGEN
445 N 5th St. Phoenix, AZ 85004 USA
O: 1-602-343-8724
F: 1-602-343-8840



	[[alternative HTML version deleted]]

