[R] everytime I download a new version of R, need I reinstall all packages?

[Berton Gunter]

> 
> I think you did not answer my question... I now upgraded my 
> main R program
> from 2.2.1 to 2.3.0 and I removed the 2.2.1 installation, but all the

Wait until after you use update.packages() to remove your previous
installation. You can keep multiple versions of R simultaneously, so this is
no problem. That is:

1) Install new R version
2) Run update.packages() on old library version
3) Copy updated old library to new library location (or point new library
location to old)
4) Remove old R version (and its libraries if you copied them)

There are probably better ways to do this, which this message may stimulate.


-- Bert