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 à 16h29 > De : sart...@voila.fr > A : r-help@r-project.org > Copie à : > 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 prévisions météo pour aujourd'hui, demain et jusqu'à 8 jours ! Voila.fr > http://meteo.voila.fr/ ___________________________________________________________ Les prévisions météo pour aujourd'hui, demain et jusqu'à 8 jours ! Voila.fr http://meteo.voila.fr/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
