[ESS] Customisation of ess-r-versions or ess-r-versions-list

[John Maindonald]

On 18/08/2011, at 5:38 AM, Stephen Eglen wrote:

>> Yes, 
>> (setq ess-s-versions-list
>>       '( ("R64" "/usr/bin/R64")
>>          ("R32" "/usr/bin/R32")))
>> works.  The buffer for R64 is however called *S+6*.  No doubt there is
>> some variable that one can set that will fix this; I have not
>> investigated.  
> I don't recall ever doing this for R, but this was quite a few years
> ago.  Did it ever work for you in earlier versions of ESS?

The lines that I had commented out had 'ess-r-versions-list'.  If this variable 
has never been available, this would be something that I tried by analogy
with 'ess-s-versions-list' and never did work.

If 'ess-s-versions-list' is to stay, it would seem to be cleanest to have a 
matching 'ess-r-versions-list' also, following the precedent of 
'ess-s-versions' and 'ess-r-versions'.  An advantage of this way of doing 
things (an  'ess-r-versions-list'), for some users at least, is that it is explicit 
about the command line statement that is invoked.

> One can have defvar in place of setq.  Does it matter which one uses?
> Better to use setq -- as it will always update the value.  By contrast:
> 
> (defvar apple 1)
> (defvar apple 2)
> 
> Evaluate both lines above, in order, and check "apple" -- it has the
> value 1.  
> 
> Stephen


John Maindonald             email: john.maindonald at anu.edu.au
phone : +61 2 (6125)3473    fax  : +61 2(6125)5549
Centre for Mathematics & Its Applications, Room 1194,
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