R help - Oct 2013 - tr: Aggregate values in one dataframe into a list of vectors of different sieze

I just found out what I was looking for, aggregate did the trick:
AggregatedList <- aggregate(data = Sample, Value ~ Name, list)

Hope this will help someone else!


Sartene Bel
> Message du 21/10/13 ? 16h29
> De : sartene at voila.fr
> A : r-help at r-project.org
> Copie ? : 
> Objet : Aggregate values in one dataframe into a list of vectors of
different sieze
> 
> Hi everyone,
> 
> I have a data frame that is quite huge (dozens of millions of lines).
> 
> It looks like this :
> 
> Name????? Value
> Name1??? 156
> Name2??? 458963
> Name3??? 758
> ...
> Name143 89325
> Name1???? 4678
> Name42?? 766
> Name144 777
> ...
> Name2???? 46767
> ...
> 
> Each name and and value has no predefined length and may be repeated any
number of times.
> 
> My goal is to have a list (aggregating the numbers relative to each name,
so to obtain a data frame which looks like this:
> Name???? Values
> Name1?? 156, 4678,...
> Name2?? 458963, 46767...
> ...
> 
> Creating the unique names in the first column is easy via the unique
function, but I did not find any way to regroup in matching vectors the
different values
aggregated for each name, of to directly create a data frame like I
want.
> 
> The ultimate goal is to use the values in the vectors to do some statistics
(means, etc.), but that is another matter for later!
> 
> Thanks for your help.
> 
> 
> Sartene Bel
> ___________________________________________________________
> Les pr?visions m?t?o pour aujourd'hui, demain et jusqu'? 8 jours !
Voila.fr http://meteo.voila.fr/
___________________________________________________________
Les pr?visions m?t?o pour aujourd'hui, demain et jusqu'? 8 jours !
Voila.fr http://meteo.voila.fr/