From Mike.Lawrence at dal.ca  Thu Sep 27 18:11:24 2007
From: Mike.Lawrence at dal.ca (Mike Lawrence)
Date: Thu, 27 Sep 2007 13:11:24 -0300
Subject: [Rd] Aggregate factor names
In-Reply-To: <971536df0709270906g2227637ev7faabf8daf05be4@mail.gmail.com>
References: <375E8B77-0436-472C-9F85-C56B46DFFEE9@DAL.CA>
	<971536df0709270906g2227637ev7faabf8daf05be4@mail.gmail.com>
Message-ID: <7C6C5FCB-6050-4E1D-9406-137989F834B9@dal.ca>

Understood, but my point is that the naming I suggest should be the  
default. One should not be 'punished' for being explicit in calling  
aggregate.


On 27-Sep-07, at 1:06 PM, Gabor Grothendieck wrote:

> You can do this:
>
> aggregate(iris[-5], iris[5], mean)
>
>
> On 9/27/07, Mike Lawrence <Mike.Lawrence at dal.ca> wrote:
>> Hi all,
>>
>> A suggestion derived from discussions amongst a number of R users in
>> my research group: set the default column names produced by aggregate
>> () equal to the names of the objects in the list passed to the 'by'
>> object.
>>
>> ex. it is annoying to type
>>
>> with(
>>        my.data
>>        ,aggregate(
>>                my.dv
>>                ,list(
>>                        one.iv = one.iv
>>                        ,another.iv = another.iv
>>                        ,yet.another.iv = yet.another.iv
>>                )
>>                ,some.function
>>        )
>> )
>>
>> to yield a data frame with names = c
>> ('one.iv','another.iv','yet.another.iv','x') when this seems more
>> economical:
>>
>> with(
>>        my.data
>>        ,aggregate(
>>                my.dv
>>                ,list(
>>                        one.iv
>>                        ,another.iv
>>                        ,yet.another.iv
>>                )
>>                ,some.function
>>        )
>> )
>>
>> --
>> Mike Lawrence
>> Graduate Student, Department of Psychology, Dalhousie University
>>
>> Website: http://memetic.ca
>>
>> Public calendar: http://icalx.com/public/informavore/Public
>>
>> "The road to wisdom? Well, it's plain and simple to express:
>> Err and err and err again, but less and less and less."
>>        - Piet Hein
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>

--
Mike Lawrence
Graduate Student, Department of Psychology, Dalhousie University

Website: http://memetic.ca

Public calendar: http://icalx.com/public/informavore/Public

"The road to wisdom? Well, it's plain and simple to express:
Err and err and err again, but less and less and less."
	- Piet Hein



[Rd] Aggregate factor names
Mike Lawrence