[R] What is the . in formula ~. syntax?

[Brian Feeny]

Thank you!  I searched in the manual, but I did not see where this is mentioned, I looked under operators 
and in some of the formula documentation.

Brian

On Nov 23, 2012, at 3:15 AM, Michael Weylandt <michael.weylandt at gmail.com> wrote:

> 
> 
> On Nov 23, 2012, at 4:26 AM, Brian Feeny <bfeeny at mac.com> wrote:
> 
>> I know if I have a dataframe with columns y, x1, x2 and I wish to have y as my y value and x1 and x2 as x values I can do:
>> y ~ x1 + x2
>> 
>> or 
>> 
>> y ~.
>> 
>> but can someone explain what . actually is or what its transposed into?
> 
> Everything not already stated. 
> 
> rmw
> 
>> 
>> I searched for this with no success, reading the "formula" manual pages.
>> 
>> Brian
>> 
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