[R] R Source Code

[Sione]

Dear Users,

I am new to R, I have just downloaded it to play with. I am a Java  & 
Matlab user, so I assume that it  wouldn't be a hurdle.  Where do I get 
to see the source codes for R  sub-packages  ? I looked at those 
sub-packages in folder  'R-ex'  for the source codes and they are 
compressed files.  Do I mean to de-compress these files where the source 
codes reside ?

Any hint would be useful.

Cheers,
Sione.