Hi dear R-users:
I have the following problem: I have a list of data.frames (12 variables and 60000 rows, each)
I have to merge from an specific point of the list to the end of the list, I am doing so with a for() loop but it is too inefficient and it exhausts memory.
How can I convert this for() loop in a function and then use lapply? ------------------------------------------------------------- LIST: list of data frames. m:point of start merging.
result<-merge(LIST[[m]],LIST[[m+1]],by="key",all.x=T) for (i in (m+2):length(LIST)) { result<-merge(result,LIST[[i]],by="key",all.x=T) }
The problem is the acumulative: "result<-merge(result,...)"
I can think in a function like this:
mergeListelem<-function(i,LS,m) { merge(LS[[m]],LS[[i]],by="key",all.x=T) }
ind<-m:length(LIST) lapply(ind,mergeListelem,LIST,m)
But I just obtain a list of merged data.frames, and I donÂt know how to join all the elements of the list in just one final data.frame.
Thank you for your help
-- Kenneth Cabrera Universidad Nacional de Colombia Tel Of 430 9351 Cel 315 504 9339 MedellÃn
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