[R] lm() notation question

[Carl Witthoft]

As others helpfully pointed out, the meaning of "." in a formula is 
provided in the Details section of ?formula.  (But NOT in ?lm)

Ista Zahn wrote:
> The help page for lm says:
> 
> "If ‘response’ is a matrix a linear model is fitted separately by
>      least-squares to each column of the matrix."
> 
> -Ista
> 
> On Sun, Nov 29, 2009 at 11:46 AM, Carl Witthoft <carl at witthoft.com> wrote:
>> Hi,
>> A recent thread provided a (working) construct for lm:
>>
>> lm(as.matrix(freeny[ix]) ~., freeny[-ix])
>>
>>
>> Can someone explain what is meant by the formula in that expression,
>> that is,  what does "mymatrix~."  do?  I couldn't find any such example in
>> the lm() or formula() help pages.
>>
>> thanks
>> Carl
>>
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>>
> 
> 
>