Hi Thanks Gabor for your suggestion. I am posting the code that worked for me.
dataframe1 = data.frame(cbind(Src = c(1,1,1,2,3), Target1 = c('aaa','bbb','ccc','aaa','ddd'))); #must be data frame dataframe2 = data.frame(cbind(Src = c(2,3,4,4,4), Target2 = c('aaaa','dddd','bbbb','eeee','ffff'))); dataframe3 = data.frame(cbind(Src = c(1,3,5,6,6), Target3 = c('xx','yy','zz','tt','uu'))); dataframe4 = data.frame(cbind(Src = c(3,5,'y','z','z'), Target4 = c('xx','yy','zz','tt','uu'))); L <- list(dataframe1, dataframe2, dataframe3, dataframe4) merge.all <- function(...) merge(..., all = TRUE) Reduce(merge.all, lapply(L, function(x) aggregate(x[2], x[1], toString))) Cheers !!! - M On Tue, Jun 14, 2011 at 11:27 AM, Gabor Grothendieck < ggrothendi...@gmail.com> wrote: > On Tue, Jun 14, 2011 at 11:21 AM, Mary Kindall <mary.kind...@gmail.com> > wrote: > > I resolved it. There was a problem in type casting at some point in my > > program. > > Thanks again. > > - > > Please post a corrected version of L for benefit of others who were > following this. > > -- > Statistics & Software Consulting > GKX Group, GKX Associates Inc. > tel: 1-877-GKX-GROUP > email: ggrothendieck at gmail.com > -- ------------- Mary Kindall Yorktown Heights, NY USA [[alternative HTML version deleted]] ______________________________________________ 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.