[ESS] How do I best set up M-x R32 and M-x R64?

[Stephen Eglen]

John Maindonald <john.maindonald at anu.edu.au> wrote:

> I can make at present make a change to ess-sit.el so that
> M-x R invokes R32 (Simon's recent R32/R64 choice for
> Snow Leopard).  But how can I easily change my setup
> so that M-x R32 invokes R32, while M-x R64 invokes R64?

ESS autodetects what versions of R are on your path using the variable
ess-r-versions:

ess-r-versions is a variable defined in `essd-r.el'.
Its value is 
("R-1" "R-2" "R-devel" "R-patched")

presumably if you have a binary called 'R64' on your path, then changing
this variable to include "R64" should then mean that you can do M-x R64
to get the 64 bit version.

Stephen